{"id":21005,"date":"2026-07-02T17:55:47","date_gmt":"2026-07-02T15:55:47","guid":{"rendered":"https:\/\/www.brasseurs-air-re2020.com\/ceiling-fan-layout-planning-best-practices-for-optimal-design\/"},"modified":"2026-07-02T17:55:59","modified_gmt":"2026-07-02T15:55:59","slug":"ceiling-fan-layout-planning-best-practices-for-optimal-design","status":"publish","type":"post","link":"https:\/\/www.brasseurs-air-re2020.com\/en\/ceiling-fan-layout-planning-best-practices-for-optimal-design\/","title":{"rendered":"Ceiling Fan Layout Planning: Best Practices for Optimal Design"},"content":{"rendered":"<div class=\"pdfprnt-buttons pdfprnt-buttons-post pdfprnt-top-right\"><a href=\"javascript: imageToPdf()\" class=\"pdfprnt-button pdfprnt-button-pdf\" target=\"_self\"><img decoding=\"async\" src=\"https:\/\/www.brasseurs-air-re2020.com\/wp-content\/plugins\/pdf-print\/images\/pdf.png\" alt=\"image_pdf\" title=\"View PDF\" \/><span class=\"pdfprnt-button-title pdfprnt-button-pdf-title\">T\u00e9l\u00e9charger l\u2019article en PDF<\/span><\/a><\/div><p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; disabled_on=&#8221;off|off|off&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font_size=&#8221;16px&#8221; header_4_line_height=&#8221;1.4em&#8221; background_color=&#8221;#d4f0fc&#8221; custom_padding=&#8221;30px|30px|30px|30px|true|true&#8221; border_width_all=&#8221;1px&#8221; border_color_all=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; box_shadow_style=&#8221;preset2&#8243; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_2_text_color%22,%22border_color_all%22%93}&#8221;]<\/p>\n<p>As shown by the aerial view of a walnut orchard in the illustration, layout planning is not exclusive to the construction industry.<br \/>Making efficient use of space, sometimes requiring circular shapes to fit within square areas, is just as important in agriculture.<br \/>Regarding ceiling fans, in June 2022 we published a <a href=\"https:\/\/www.brasseurs-air-re2020.com\/en\/ceiling-fans-what-are-the-layout-rules\/\">technical article on the subject<\/a>, which was updated in September 2024.<br \/>Since then, our field experience has grown considerably, and several studies of public interest have been published.<br \/>In this article, we present the latest best practices for ceiling fan layout planning.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<h2>Article Contents<\/h2>\n<p><\/p>\n<ul>\n<li><a href=\"#berkeley\">The University of California, Berkeley: A Leading Source of Knowledge<\/a><\/li>\n<li><a href=\"#bair-brasse1-brise\">B-Air, Brasse 1, Brise: Improving Industry Practices<\/a><\/li>\n<li><a href=\"#cellule\">The &#8220;Cell&#8221;: Dividing a Room into Subspaces<\/a><\/li>\n<li><a href=\"#zone-influence\">The Fan Coverage Area<\/a><\/li>\n<li><a href=\"#hauteur-pales\">Blade Height Above the Floor: What Are the Requirements?<\/a><\/li>\n<li><a href=\"#distance-plafond\">Blade-to-Ceiling Clearance: How Does It Affect Air Speed?<\/a><\/li>\n<li><a href=\"#vitesse-air\">Air Speed and the Cooling Effect<\/a><\/li>\n<li><a href=\"#diametre-brasseur\">Fan Diameter: How to Choose the Right Size<\/a><\/li>\n<li><a href=\"#fcc\">The Cell Coverage Factor (FCC)<\/a><\/li>\n<li><a href=\"#ff\">The Cell Shape Factor (FF): Solving the Circle-in-a-Square Challenge<\/a><\/li>\n<li><a href=\"#distances\">Clearance Requirements<\/a>\n<ul>\n<li><a href=\"#distance-mur\">Blade-to-Wall Clearance<\/a><\/li>\n<li><a href=\"#distance-brasseurs\">Spacing Between Ceiling Fans<\/a><\/li>\n<li><a href=\"#luminaires\">Light Fixtures: Avoiding the Stroboscopic Effect<\/a><\/li>\n<li><a href=\"#videoprojecteurs\">Ceiling-Mounted Projectors: What Clearances Should Be Maintained?<\/a><\/li>\n<\/ul>\n<p><\/li>\n<p><\/p>\n<li><a href=\"#taux-couverture\">Usable Floor Area Coverage Ratio: How Is It Calculated?<\/a><\/li>\n<p><\/p>\n<li><a href=\"#vitesse-re2020\">Obtaining Air Speed Using the RE2020 Calculation Method: What Is the Practical Value?<\/a><\/li>\n<p><\/p>\n<li><a href=\"#exhale\">Exhale Ceiling Fans: Specific Layout Considerations<\/a><\/li>\n<p><\/p>\n<li><a href=\"#appui-professionnels\">Support for Design Professionals<\/a><\/li>\n<p><\/p>\n<li><a href=\"#lecon-humilite\">Ceiling Fan Layout Planning: A Lesson in Humility<\/a><\/li>\n<p><\/p>\n<li><a href=\"#glossaire\">Glossary<\/a><\/li>\n<p><\/p>\n<li><a href=\"#synthese-regles\">Summary of Best Practice Guidelines<\/a><\/li>\n<p><\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;berkeley&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>The University of California, Berkeley: A Leading Source of Expertise<\/h2>\n<p><\/p>\n<p>With ceiling fans installed in more than 65% of homes in the United States<a href=\"#_edn1\" name=\"_ednref1\">[i]<\/a>, compared with barely 5% in mainland France<a href=\"#_edn2\" name=\"_ednref2\">[ii]<\/a> and around 30% in France&#8217;s tropical overseas territories<a href=\"#_edn3\" name=\"_ednref3\">[iii]<\/a>, the United States has a considerable head start in this field.<\/p>\n<p><\/p>\n<p>As early as 2020, the Berkeley Center for the Built Environment (CBE) published its <em>Ceiling Fan Design Guide<\/em><a href=\"#_edn4\" name=\"_ednref4\">[iv]<\/a>, which has become a widely respected reference among building professionals.<\/p>\n<p><\/p>\n<p>The guide introduces and reinforces a number of useful concepts and design principles, including:<\/p>\n<p><\/p>\n<ul>\n<li>The concept of <strong>Cells<\/strong><\/li>\n<li><strong>Cell Coverage Factor (FCC)<\/strong><\/li>\n<li><strong>Cell Shape Factor (FF)<\/strong><\/li>\n<li>Blade-to-wall clearances<\/li>\n<li>The stroboscopic effect caused by lighting fixtures<\/li>\n<\/ul>\n<p><\/p>\n<p>The CBE has also developed a software tool to assist with ceiling fan layout planning. Unfortunately, it is currently not operational<a href=\"#_edn5\" name=\"_ednref5\">[v]<\/a>.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;bair-brasse1-brise&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>B-Air, Brasse 1 and Brise: Advancing Best Practices<\/h2>\n<p>As the use of ceiling fans continues to grow across France, several publicly funded initiatives have expanded and refined the body of knowledge surrounding ceiling fan design and installation:<\/p>\n<ul>\n<li>B-AIR<a href=\"#_edn6\" name=\"_ednref6\">[6]<\/a>, developed as part of the Ombree programme, funded through the French Energy Savings Certificate (CEE) scheme, with EDF SEI as the obligated funding partner and coordinated by the French Construction Quality Agency (AQC).<\/li>\n<li>Brise<a href=\"#_edn7\" name=\"_ednref7\">[7]<\/a>, also carried out within the Ombree programme, with support from ADEME and once again coordinated by the AQC.<\/li>\n<li>Brasse 1<a href=\"#_edn8\" name=\"_ednref8\">[8]<\/a>, a research project selected under the <em>Responsible Buildings 2020<\/em> research programme, funded by ADEME and conducted by the engineering consultancy Surya Consultants.<\/li>\n<\/ul>\n<p>Brise has produced a pre-layout planning spreadsheet that incorporates the findings of both B-AIR and Brasse 1. The tool is available in the Resources section of the guide<a href=\"#_edn9\" name=\"_ednref9\">[9]<\/a>.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/1-visuel-brise-16-06-2026.webp&#8221; alt=&#8221;Brise Pre-Layout Planning Tool&#8221; title_text=&#8221;1-visuel-brise-16-06-2026&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 1: Screenshot of the Brise Pre-Layout Planning Tool<\/em><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>According to its developers, the tool is intended to support the preliminary design phase.<\/p>\n<p>This article goes a step further by providing designers and installers with the key principles and practical guidance needed to produce an effective ceiling fan layout.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;cellule&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>The &#8220;Cell&#8221;: Dividing a Room into Subspaces<\/h2>\n<p>The concept of a <strong>cell<\/strong> becomes relevant whenever a room is large enough to require more than one ceiling fan\u2014for example, open-plan offices, classrooms, or large living areas.<\/p>\n<p>In such cases, the room volume is divided into individual cells according to a simple principle: each cell should contain only one ceiling fan, and that fan should provide the best possible coverage of the cell.<\/p>\n<p>A cell does not necessarily correspond to a physical partition; it is a design tool used to optimise the layout of ceiling fans.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/2-cellule-16-06-2026.webp&#8221; alt=&#8221;The &quot;Cell&quot;: Dividing a Room into Functional Zones&#8221; title_text=&#8221;2-cellule-16-06-2026&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221; width=&#8221;70%&#8221; width_last_edited=&#8221;on|phone&#8221; sticky_enabled=&#8221;0&#8243; width_phone=&#8221;&#8221; width_tablet=&#8221;70%&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 2: Dividing a Room into Cells<\/em><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;zone-influence&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Ceiling Fan Coverage Area<\/h2>\n<p>Depending on the type of ceiling fan, the airflow distribution pattern varies.<\/p>\n<p>For bladed ceiling fans, the area of influence typically takes the shape of a cone or, directly beneath the blades, a cylinder. The area outside this direct airflow zone is known as the <em>recirculation zone<\/em>.<\/p>\n<p>The Exhale ceiling fan stands out by providing a more uniform distribution of air throughout the room. Whereas conventional bladed ceiling fans generally produce higher air velocities in specific areas, Exhale generates a more evenly distributed, gentler and less directional airflow.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2024\/09\/GB-facing-air-speed-samarat-exhale-01.jpg&#8221; alt=&#8221;The &quot;Cell&quot;: Dividing a Room into Functional Zones&#8221; title_text=&#8221;mise-en-regard-vitesse-air-samarat-exhale-01&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 3: Ceiling Fan Coverage Areas<\/em><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;hauteur-pales&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Blade Height Above the Floor: What Are the Requirements?<\/h2>\n<p>The requirements are straightforward: to be marketed within the European Union, a ceiling fan must state in its installation manual that the minimum distance between the floor and the blades is 2.30&nbsp;m. <strong>Failure to comply with this requirement may expose the designer, specifier or installer to liability in the event of an accident.<\/strong><\/p>\n<p>One of our blog articles<a href=\"#_edn10\" name=\"_ednref10\">[10]<\/a> is dedicated entirely to this topic.<\/p>\n<p>That said, <strong>what is the maximum recommended installation height for a ceiling fan?<\/strong><\/p>\n<p>Neither French nor international literature provides a definitive answer. Based on our field experience, we recommend that, for summer thermal comfort applications, the fan diameter should be at least one-third of the ceiling height. For example, a ceiling fan with a diameter of 1.32&nbsp;m should not be installed on a ceiling higher than 3.96&nbsp;m unless it is suspended closer to the floor using downrods.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;distance-plafond&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Blade-to-Ceiling Clearance: How Does It Affect Air Speed?<\/h2>\n<p>For bladed ceiling fans, the impact of limited blade-to-ceiling clearance on air speed is still the subject of discussion. It is generally accepted that installing a fan too close to the ceiling can reduce the airflow velocity it generates, although the extent of this reduction has not yet been fully established.<\/p>\n<p>In spaces intended for light, sedentary activities\u2014such as offices, homes, classrooms or healthcare facilities\u2014the air speed recommended by the NF EN ISO 7730 standard is approximately 0.8&nbsp;m\/s.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/4-vitesse-air-norme-iso-7730.webp&#8221; alt=&#8221;Blade-to-Ceiling Clearance: What Is the Impact on Air Speed?&#8221; title_text=&#8221;4-vitesse-air-norme-iso-7730&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 4: Excerpt from NF EN ISO 7730<\/em><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>Measurements were carried out in an 11&nbsp;m\u00b2 room with a ceiling height of 2.70&nbsp;m, equipped with a Samarat one-piece ceiling fan. In this configuration, the blades are positioned 16&nbsp;cm below the ceiling. The average air speed measured throughout the room reached 0.91&nbsp;m\/s, rising to 1.22&nbsp;m\/s directly beneath the fan. These results fully meet the thermal comfort objectives defined by the NF EN ISO 7730 standard.<\/p>\n<p>Another factor is also worth considering. In the United States, the Energy Star programme assesses the energy performance of electrical appliances, including ceiling fans.<\/p>\n<p>We identified 53 <em>hugger<\/em> ceiling fans\u2014that is, models with a blade-to-ceiling clearance of 25&nbsp;cm or less<a href=\"#_edn11\" name=\"_ednref11\">[11]<\/a>\u2014with a diameter of 1.32&nbsp;m. All have received the programme&#8217;s highest rating, <em>Most Efficient<\/em>. This rating is based on the ratio between the airflow delivered and the electrical power consumed.<\/p>\n<p>These findings demonstrate that hugger ceiling fans, despite their limited blade-to-ceiling clearance, can be an effective solution, provided their performance has been properly validated.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;vitesse-air&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Air Speed and the Cooling Effect<\/h2>\n<p>The <strong>Cooling Effect (CE)<\/strong>, based on research conducted by ASHRAE<a href=\"#_edn12\" name=\"_ednref12\">[12]<\/a>, establishes the relationship between air speed and the reduction in perceived temperature.<\/p>\n<p>The diagram below, based on the findings of the Brasse&nbsp;1 research programme, illustrates the effect of air speeds from as low as 0.2&nbsp;m\/s for a standard occupant (1.74&nbsp;m tall, weighing 74&nbsp;kg) performing seated filing work while wearing typical summer clothing (relative humidity of 50%).<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/5-visuel-vitesse-d-air-et-temperature.webp&#8221; alt=&#8221;Air Speed and the Cooling Effect&#8221; title_text=&#8221;5-visuel-vitesse-d-air-et-temperature&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 5: Calculated Cooling Effect as a Function of Air Speed<\/em><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>In the Brasse&nbsp;1 report, the baseline conditions were slightly adjusted compared with those used for the previous diagram. The reference temperature was set at 28\u00b0C with a relative humidity of 60% (instead of 50%). The reference activity was also changed to computer work, which has a slightly lower metabolic rate than filing.<\/p>\n<p>Brasse&nbsp;1 also proposed a relationship between air speed and the Cooling Effect (CE)<a href=\"#_edn13\" name=\"_ednref13\">[13]<\/a>, providing a close approximation of the ASHRAE equation:<\/p>\n<p>CE = 1.53 ln (air speed) + 3.444<\/p>\n<p>The graph below illustrates the result of this equation. It shows that at an indoor temperature of 28\u00b0C, an air speed of 0.8&nbsp;m\/s provides a <strong>perceived cooling effect of 3.1\u00b0C.<\/strong><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; disabled_on=&#8221;on|on|on&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; disabled=&#8221;on&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<table style=\"border-collapse: collapse; width: auto;\">\n<tbody>\n<tr>\n<th style=\"border: 1px solid #ccc; padding: 8px 16px;\">Air Speed (m\/s)<\/th>\n<th style=\"border: 1px solid #ccc; padding: 8px 16px;\">Estimated Cooling Effect (\u00b0C)<\/th>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.2<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">1.0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.3<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">1.6<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.4<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">2.0<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.5<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">2.4<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.6<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">2.7<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.7<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">2.9<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.8<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">3.1<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">0.9<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">3.3<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">1.0<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px 16px; text-align: center;\">3.4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>[\/et_pb_text][et_pb_code _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<div class=\"tableau-vitesse\">\n<table>\n<thead>\n<tr>\n<th>Air Speed (m\/s)<\/th>\n<th>Estimated Cooling Effect (\u00b0C)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.2<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">1.0<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.3<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">1.6<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.4<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">2.0<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.5<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">2.4<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.6<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">2.7<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.7<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">2.9<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.8<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">3.1<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">0.9<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">3.3<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Air Speed (m\/s)\">1.0<\/td>\n<td data-label=\"Estimated Cooling Effect (\u00b0C)\">3.4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><!\u2013- [et_pb_br_holder] -\u2013><pee>\n<style>\n.tableau-vitesse {\n  text-align: left;\n}<\/p>\n<p>.tableau-vitesse table {\n  width: auto !important;\n  max-width: 100%;\n  margin: 0;\n  border-collapse: collapse;\n  font-family: inherit;\n  display: inline-table;\n}<\/p>\n<p>.tableau-vitesse th,\n.tableau-vitesse td {\n  border: 1px solid #ccc;\n  padding: 10px 24px;\n  text-align: center;\n}<\/p>\n<p>.tableau-vitesse thead {\n  background-color: #f2f2f2;\n  font-weight: bold;\n}<\/p>\n<p>.tableau-vitesse tbody tr:nth-child(even) {\n  background-color: #fafafa;\n}<\/p>\n<p>@media (max-width: 600px) {\n  .tableau-vitesse table {\n    width: 100% !important;\n    display: table;\n  }<\/p>\n<p>  .tableau-vitesse thead {\n    display: none;\n  }<\/p>\n<p>  .tableau-vitesse tr {\n    display: block;\n    margin-bottom: 12px;\n    border: 1px solid #ccc;\n    border-radius: 6px;\n    overflow: hidden;\n  }<\/p>\n<p>  .tableau-vitesse td {\n    display: flex;\n    justify-content: space-between;\n    align-items: center;\n    border: none;\n    border-bottom: 1px solid #eee;\n    text-align: right;\n  }<\/p>\n<p>  .tableau-vitesse td::before {\n    content: attr(data-label);\n    font-weight: bold;\n    text-align: left;\n    margin-right: 12px;\n    white-space: nowrap;\n  }<\/p>\n<p>  .tableau-vitesse td:last-child {\n    border-bottom: none;\n  }\n}\n<\/style>\n<\/pee>[\/et_pb_code][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>The air speed values specific to each device can be found in the <a href=\"https:\/\/www.brasseurs-air-re2020.com\/espace-pro\/outils-pour-be\/\">professional section of the website<\/a> (engineering tools by product \/ product selection \/ air speed measurements).<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;diametre-brasseur&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Fan Diameter: How to Choose the Right Size<\/h2>\n<p>Today, most of the market is focused on 1.32&nbsp;m diameter ceiling fans, although a wide range of sizes is available.<\/p>\n<p>For rooms smaller than 10&nbsp;m\u00b2, smaller units are generally more suitable. For spaces larger than 15&nbsp;m\u00b2, larger fans (for example, 1.52&nbsp;m diameter) can often make better use of the air volume to be conditioned.<\/p>\n<p>As a reminder, the range of models with diameters strictly greater than 1.52&nbsp;m remains relatively limited.<\/p>\n<p>For typical large spaces such as offices, living rooms, or classrooms with ceiling heights below 3.50&nbsp;m, fan diameters are mainly concentrated in the 1.32&nbsp;m and 1.52&nbsp;m ranges.<\/p>\n<p>1.52&nbsp;m diameter fans have both advantages and limitations:<\/p>\n<ul>\n<li>They deliver similar air speeds to 1.32&nbsp;m fans while rotating more slowly. This generally results in quieter operation and lower energy consumption.<\/li>\n<li>They are rarely suitable for spaces with low ceiling heights.<\/li>\n<li>Precise layout planning can be more difficult, and areas of uneven coverage may remain.<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;fcc&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Cell Coverage Factor (FCC)<\/h2>\n<p>This concept is based on a simple principle: the fan diameter is divided by the square root of the cell area.<\/p>\n<p><em>FCC = fan diameter \/ square root of the cell area<\/em><\/p>\n<p>For example, in a 4 m by 3 m cell equipped with a 1.32 m diameter ceiling fan, the calculation is as follows:<\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; disabled_on=&#8221;on|on|on&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; disabled=&#8221;on&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>FCC = <span style=\"display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 4px;\"> <span style=\"border-bottom: 1px solid black; padding: 0 4px;\">1.32<\/span> <span style=\"padding: 0 4px;\">\u221a(3\u00d74)<\/span> <\/span> = 38%<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/formule-fcc-01.webp&#8221; title_text=&#8221;formule-fcc-01&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>This is where caution is required. Indeed, <strong>both the Berkeley Design Guide and the French studies that have been published consider that the FCC value should be between 20 and 40%.<\/strong><\/p>\n<p>However, our field feedback, as well as that of AFPVP (the French Professional Association of Ceiling Fan Manufacturers), points to the same conclusion: to achieve good summer comfort performance, the FCC is ideally in the 35\u201340% range.<\/p>\n<p>This is not an absolute threshold. A design calibrated at 34% or 41% may still perform well. However, the 35\u201340% range provides a robust operational benchmark for balancing airflow effectiveness, occupant comfort, and installation efficiency.<\/p>\n<p>For a 1.32&nbsp;m diameter ceiling fan, the theoretical coverage areas are as follows:<\/p>\n<ul>\n<li>General formula: Area = (Diameter \/ FCC)\u00b2<\/li>\n<li>For an FCC of 35%: Area = (1.32 \/ 0.35)\u00b2 = 14.2 m\u00b2<\/li>\n<li>For an FCC of 40%: Area = (1.32 \/ 0.40)\u00b2 = 10.9 m\u00b2<\/li>\n<\/ul>\n<p>It is therefore clear that the choice of FCC reflects a design strategy.<\/p>\n<p>With an FCC of 40%, the covered cell is more compact: this corresponds to a <strong>enhanced comfort<\/strong> configuration, with higher air speeds and improved perceived uniformity.<\/p>\n<p>With an FCC of 35%, the covered cell is larger: this corresponds to an <strong>optimised efficiency<\/strong> configuration, reducing the number of units required while maintaining a relevant level of summer comfort.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/6-fcc-20-et-40-pour-cent.webp&#8221; alt=&#8221;Cell Coverage Factor (FCC)&#8221; title_text=&#8221;6-fcc-20-et-40-pour-cent&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 6: Visual comparison of cells based on FCC \u2013 1.32 m diameter ceiling fan<\/em><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><strong>The visual above shows that with an FCC of 20%, a 1.32&nbsp;m ceiling fan would be expected to cover a 43.5&nbsp;m\u00b2 cell, which is not appropriate for summer thermal comfort.<\/strong> An FCC of 40% appears to be much more suitable.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;ff&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Cell Shape Factor (FF): Solving the Circle-Square Challenge<\/h2>\n<p>When addressing cell coverage areas, it becomes clear that the influence zone of ceiling fans\u2014particularly bladed models\u2014is inherently circular in nature.<\/p>\n<p>However, the division of typical spaces, which are generally rectangular in shape, naturally results in the creation of rectangular or at best square cells.<\/p>\n<p>This is where the <strong>Shape Factor<\/strong> comes into play, corresponding to the <strong>length-to-width ratio<\/strong>:<\/p>\n<p><em>FF = cell length \/ cell width<\/em><\/p>\n<p>Depending on the layout configuration, cells can take on very different shapes.<\/p>\n<p>In the example below, the room measures 8 m \u00d7 6 m:<\/p>\n<ul>\n<li>The upper cells have a shape factor of 1.1 [3 m \/ (1\/3 \u00d7 8 m)]<\/li>\n<li>The lower cells have a shape factor of 1.3 [4 m \/ 3 m]<\/li>\n<\/ul>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/7-cellules-et-facteur-de-forme-16-06-2026.webp&#8221; alt=&#8221;Cell Shape Factor (FF): Solving the Circle\u2013Square Dilemma&#8221; title_text=&#8221;7-cellules-et-facteur-de-forme-16-06-2026&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221; width=&#8221;70%&#8221; width_last_edited=&#8221;on|phone&#8221; width_tablet=&#8221;70%&#8221; width_phone=&#8221;70%&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 7: Cells with different shape factors (length = 8 m, width = 6 m)<\/em><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>A shape factor (FF) close to 1 corresponds to a square cell. As the FF increases, the cell becomes more elongated, and the effectiveness of coverage by a circular influence zone decreases.<\/p>\n<p>In practice, certain layouts may still be justified even when deviating from a shape factor of 1.<\/p>\n<p>For example, in the classroom layout below, it may be appropriate in some cases to validate the configuration (with the desk located on the right), given that the teacher is positioned directly beneath the ceiling fan.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/8-ff-eleve-et-enseignant.webp&#8221; alt=&#8221;Cells with a High Shape Factor (length = 8 m, width = 6 m)&#8221; title_text=&#8221;8-ff-eleve-et-enseignant&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221; width=&#8221;70%&#8221; width_last_edited=&#8221;on|phone&#8221; width_tablet=&#8221;70%&#8221; width_phone=&#8221;70%&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 8: Cells with a high shape factor (length = 8 m, width = 6 m)<\/em><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;distances&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Clearance Considerations<\/h2>\n<p>When dealing with clearance distances, two key reference points must be distinguished:<\/p>\n<ul>\n<li>The fan\u2019s rotation axis is used as the primary reference in a layout design approach; it answers the question: \u201cWhere will the unit be installed?\u201d<\/li>\n<li>The blade tips are more relevant from an airflow perspective, as they help define influence zones and account for potential obstacles.<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;distance-mur&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h3>Blade-to-Wall Clearance<\/h3>\n<p>The findings of the Brasse&nbsp;1 programme suggest that, for bladed ceiling fans, a minimum distance of 1 diameter (1D) should be maintained between the fan\u2019s rotation axis and the wall.<\/p>\n<p>This corresponds to a minimum clearance of 0.5D between the blade tips and the wall.<\/p>\n<p>In practical terms, for a 1.32&nbsp;m diameter fan, this represents a minimum clearance of more than 0.66&nbsp;m.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/9-distances-pales-mur-v2.webp&#8221; alt=&#8221;Illustration of clearances in a case with FCC at 40%&#8221; title_text=&#8221;9-distances-pales-mur-v2&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221; width=&#8221;70%&#8221; width_last_edited=&#8221;on|phone&#8221; width_tablet=&#8221;70%&#8221; width_phone=&#8221;70%&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 9: Illustration of clearances in a case with FCC at 40%<\/em><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>What does this blade-to-wall clearance translate to in a reference configuration? Here, we consider a room where an FCC of 40% is respected, using a 1.32&nbsp;m diameter ceiling fan and an ideal shape factor of 1.<\/p>\n<p>In this configuration, with the fan positioned at the centre of the cell, the blade-to-wall clearance is 0.99&nbsp;m, corresponding to a blade-to-wall distance of 0.75D and an axis-to-wall distance of 1.25D.<\/p>\n<p>This logic can of course be extrapolated to different fan sizes.<\/p>\n<p>As a result, the Brasse limit appears to represent a lower bound.<\/p>\n<p>Where feasible, a clearance of 0.75D between the blade tips and the wall will often be preferable, although site-specific constraints always take precedence. For example, in a classroom where desks are placed against the side walls, care must be taken to ensure that students seated along the walls still benefit from the airflow effect.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;distance-brasseurs&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h3>Spacing Between Ceiling Fans<\/h3>\n<p>The same Brasse&nbsp;1 report indicates that the spacing between fan rotation axes should be 2.5D.<\/p>\n<p>This corresponds to a distance of 1.5D between blade tips on the same basis.<\/p>\n<p>Using the FCC 40% configuration presented above, the 1.98&nbsp;m spacing between two 1.32&nbsp;m diameter ceiling fans corresponds precisely to 1.5 blade diameters.<\/p>\n<p>In light of the previous observations, this 1.5D blade-to-blade spacing appears to be an acceptable value when seeking both good performance and satisfactory air speed uniformity.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;luminaires&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h3>Lighting Fixtures: Avoiding the Stroboscopic Effect<\/h3>\n<p>The stroboscopic effect occurs when fan blades periodically interrupt a light beam. This can lead to significant visual discomfort. It is therefore important to ensure adequate spacing between the blades and light beams, even when the blades are positioned below the lighting fixtures.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/10-effet-stroboscopique.webp&#8221; alt=&#8221;Avoid blade passage through the light beam.&#8221; title_text=&#8221;10-effet-stroboscopique&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221; width=&#8221;70%&#8221; width_last_edited=&#8221;on|phone&#8221; width_tablet=&#8221;70%&#8221; width_phone=&#8221;70%&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<em>Figure 10: Avoiding blade passage through the light beam<\/em>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>Thus, during the layout design phase, ceiling fans must be positioned in coordination with the lighting plan, and not solely based on the walls or the geometry of the room.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;videoprojecteurs&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h3>Ceiling-Mounted Projectors: What Clearance Should Be Maintained?<\/h3>\n<p>For these devices, two aspects must be considered:<\/p>\n<ul>\n<li>the risk of physical collision between the fan blades and the projector;<\/li>\n<li>interruption of the projection beam by the blades.<\/li>\n<\/ul>\n<p>For blade-to-projector clearance, we recommend:<\/p>\n<ul>\n<li>a standard 600 mm \u00d7 600 mm ceiling tile spacing between the blade tips and the projector;<\/li>\n<li>that blade tips be positioned at least \u00bcD away from the beam, which is assumed to have a total angle of 37\u00b0, i.e. 18.5\u00b0 on either side of the lens axis.<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;taux-couverture&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Usable Floor Area Coverage Ratio: How Is It Calculated?<\/h2>\n<p>The usable floor area coverage ratio defines the proportion of usable floor area that benefits from air movement. It is calculated using a reference Cell Coverage Factor (FCC) of 40%.<\/p>\n<p>The usable floor area corresponds to the room size after subtracting clearance areas (zones that are not intended to be covered by airflow).<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/11-materialisation-surface-utile-surface-degagement.webp&#8221; alt=&#8221;Figure: Representation of usable floor area and clearance zones within a room&#8221; title_text=&#8221;11-materialisation-surface-utile-surface-degagement&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221; width=&#8221;70%&#8221; width_last_edited=&#8221;on|phone&#8221; width_tablet=&#8221;70%&#8221; width_phone=&#8221;70%&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><em>Figure 11: Representation of usable floor area and clearance zones within a room<\/em><\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>For a bladed ceiling fan, the theoretical covered area per unit is: (diameter \/ 0.40)\u00b2<\/p>\n<p>The displayed coverage rate is then calculated as:<\/p>\n<p>(theoretical covered area per unit \u00d7 number of units) \/ (usable floor area).<\/p>\n<p>This provides a quick way to compare the coverage level of a layout against the actual area to be treated.<\/p>\n<p>For example, if four 1.32&nbsp;m diameter ceiling fans are installed in a 8.00&nbsp;m \u00d7 7.00&nbsp;m room (usable floor area: 56&nbsp;m\u00b2), the following values are obtained:<\/p>\n<p>Theoretical area per unit = (1.32 \/ 0.40)\u00b2 = 3.30\u00b2 = 10.89&nbsp;m\u00b2<\/p>\n<p>For four units: 10.89 \u00d7 4 = 43.56&nbsp;m\u00b2<\/p>\n<p>Then, for a usable area of 56.00&nbsp;m\u00b2: 43.56 \/ 56.00 \u00d7 100 = 77.8%<\/p>\n<p>It should be remembered that a good coverage rate alone does not guarantee a good layout: it must be considered together with the shape factor, wall clearances, obstacles, and actual occupancy conditions.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;vitesse-re2020&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Obtaining Air Velocity According to the RE2020 Calculation Method: What Is the Operational Value?<\/h2>\n<p>The RE2020 framework allows the calculation of a theoretical air velocity using the following formula:<\/p>\n<p>Air velocity = 0.0032 \u00d7 (total airflow rate in m\u00b3\/h) \/ (volume in m\u00b3)<\/p>\n<p>The air velocity calculated under RE2020 is a conventional indicator. It enables comparison between configurations within a regulatory framework, while recognizing that it does not correspond to an in-situ measurement.<\/p>\n<p>Its operational value is therefore twofold: to verify the order of magnitude of a solution and to compare different layout design options, without replacing a more detailed comfort analysis.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;exhale&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Exhale Ceiling Fans: Specific Layout Considerations<\/h2>\n<p>All the layout principles presented above are suited to bladed ceiling fans.<\/p>\n<p>However, Exhale devices do not behave like conventional bladed fans. Their main advantage lies in a more evenly distributed airflow, with a less directional jet. On the other hand, they are generally less effective when the primary objective is to achieve high air speeds within the occupied zone.<\/p>\n<p>As a result, for :contentReference[oaicite:0]{index=0} units, both the operating principle and the diameter lead to adaptations derived from field experience since 1996.<\/p>\n<ul>\n<li>Recommended distance between disc and wall: 1D<\/li>\n<li>Recommended distance between discs: 2D<\/li>\n<\/ul>\n<p>The cell coverage factor is calculated by applying a multiplier coefficient of 1.5 to the device diameter.<\/p>\n<p>This 1.5 coefficient is a layout rule derived from practical experience, and should not be interpreted as an increase of the physical diameter.<\/p>\n<p>It should be remembered that this coefficient applies only to layout design, not to airflow calculations within a cell or room.<\/p>\n<p>For usable area coverage, with :contentReference[oaicite:1]{index=1} devices, the adjusted equivalent diameter is used in the theoretical area calculation: ((diameter \u00d7 1.5) \/ 0.40)\u00b2.<\/p>\n<p>The rest of the calculations remain identical for devices and for bladed ceiling fans.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;appui-professionnels&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Support for Professionals<\/h2>\n<p>Our organization has developed Calepinator, an internal tool that enables professionals to generate an initial layout plan.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.brasseurs-air-re2020.com\/wp-content\/uploads\/2026\/06\/12-calepinator.webp&#8221; alt=&#8221;Internal software interface of Brasseurs-AIR RE2020&#8243; title_text=&#8221;12-calepinator&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||15px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; border_width_all=&#8221;1px&#8221;][\/et_pb_image][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||true|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<em>Figure 12: Screenshot of the Brasseurs-AIR RE2020 internal software<\/em>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>Based on a scaled floor plan, ceiling height, room type, and known constraints, Calepinator generates an initial layout: number of units, positioning, coverage rate, key clearances, and critical design considerations.<\/p>\n<p>This preliminary layout must then be cross-checked against real site conditions: lighting, beams, projectors, building services, electrical constraints, and actual occupancy zones.<\/p>\n<p>You may contact our team to access this service, noting that a lightweight version of the tool is expected to be available in our professional portal during 2026.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;lecon-humilite&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Ceiling Fan Layout Design: A Lesson in Humility<\/h2>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; disabled_on=&#8221;off|off|off&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font_size=&#8221;16px&#8221; header_4_line_height=&#8221;1.4em&#8221; background_color=&#8221;#d4f0fc&#8221; custom_padding=&#8221;30px|30px|30px|30px|true|true&#8221; border_width_all=&#8221;1px&#8221; border_color_all=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; box_shadow_style=&#8221;preset2&#8243; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_2_text_color%22,%22border_color_all%22,%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p><u>Historical reference: the integration of ceiling fans into RE2020.<\/u><\/p>\n<p>All stakeholders involved in layout design should acknowledge :contentReference[oaicite:0]{index=0}. This former head of the energy division at :contentReference[oaicite:1]{index=1} played a key role in introducing ceiling fans into RE2020, giving official recognition to a product that had already proven its effectiveness in France\u2019s overseas territories.<\/p>\n<p>The inclusion of ceiling fans within the regulatory framework has transformed these devices from what was still, until recently, a niche product into a mainstream piece of equipment that is now widely adopted by end users.<\/p>\n<p>[\/et_pb_text][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<p>Recent years have seen significant progress in knowledge related to ceiling fans, and this knowledge continues to evolve continuously.<\/p>\n<p>The state of the art described in this article demonstrates its relevance, as our previous publications on the same topic have been refined over time without undergoing fundamental changes in their core principles.<\/p>\n<p>Ceiling fan layout design is not a mechanical exercise. General rules are essential, but they must always be adapted to the geometry of the space, its usage, furniture layout, ceiling constraints, lighting fixtures, and the specific characteristics of the equipment.<\/p>\n<p>We will remain available to support and inform you.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;glossaire&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Glossary<\/h2>\n<p>[\/et_pb_text][et_pb_code _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<div class=\"tableau-termes\">\n<table>\n<thead>\n<tr>\n<th>Term<\/th>\n<th>Definition<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td data-label=\"Term\">Cell<\/td>\n<td data-label=\"Definition\">Sub-area associated with a single fan<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Term\">D<\/td>\n<td data-label=\"Definition\">Fan diameter<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Term\">FCC<\/td>\n<td data-label=\"Definition\">Ratio between diameter and the square root of the cell area<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Term\">FF<\/td>\n<td data-label=\"Definition\">Cell length-to-width ratio<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Term\">Usable floor area<\/td>\n<td data-label=\"Definition\">Area actually requiring airflow treatment<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Term\">Clearance area<\/td>\n<td data-label=\"Definition\">Area that does not need to be ventilated<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Term\">Usable area coverage ratio<\/td>\n<td data-label=\"Definition\">Ratio between the theoretical area covered by the devices (using a 40% FCC reference) and the usable floor area<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Term\">Cooling effect<\/td>\n<td data-label=\"Definition\">Perceived temperature reduction due to air velocity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>[\/et_pb_code][\/et_pb_column][\/et_pb_row][et_pb_row module_id=&#8221;synthese-regles&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||on||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font_size=&#8221;20px&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93}&#8221;]<\/p>\n<h2>Summary of Design Rules<\/h2>\n<p>[\/et_pb_text][et_pb_code _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<div class=\"tableau-regles\">\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>Topic<\/th>\n<th>Practical rule<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td rowspan=\"6\" data-label=\"Category\"><strong>Bladed ceiling fans<\/strong><\/td>\n<td data-label=\"Topic\">Blade-to-floor height<\/td>\n<td data-label=\"Practical rule\">Minimum 2.30 m<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Target FCC<\/td>\n<td data-label=\"Practical rule\">35\u201340% for summer comfort<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Axis-to-wall distance<\/td>\n<td data-label=\"Practical rule\">Minimum 1D<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Blade-to-wall distance<\/td>\n<td data-label=\"Practical rule\">Minimum 0.5D, preferably 0.75D when possible<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Axis-to-axis spacing between fans<\/td>\n<td data-label=\"Practical rule\">2.5D<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Edge-to-edge spacing<\/td>\n<td data-label=\"Practical rule\">1.5D<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\" data-label=\"Category\"><strong>Exhale<\/strong><\/td>\n<td data-label=\"Topic\">Disc-to-wall distance<\/td>\n<td data-label=\"Practical rule\">1D<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Disc-to-disc distance<\/td>\n<td data-label=\"Practical rule\">2D<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Equivalent diameter for layout<\/td>\n<td data-label=\"Practical rule\">D \u00d7 1.5 for layout calculations<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\" data-label=\"Category\"><strong>Obstacles<\/strong><\/td>\n<td data-label=\"Topic\">Lighting fixtures<\/td>\n<td data-label=\"Practical rule\">Avoid any blade passage through light beams to prevent stroboscopic effects<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Projector clearance (device)<\/td>\n<td data-label=\"Practical rule\">Maintain at least one 600 \u00d7 600 mm ceiling tile between blade tips and projector<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Topic\">Projector beam clearance<\/td>\n<td data-label=\"Practical rule\">Keep blade tips at least \u00bcD away from the projection beam (typically \u00b118.5\u00b0 from optical axis)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text ul_item_indent=&#8221;25px&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; text_text_color=&#8221;gcid-49f96d57-8f93-4e8f-9dd7-a2d923a1dfd2&#8243; text_font_size=&#8221;13px&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;gcid-70ff693f-6f97-4074-be90-9adb196c4afe&#8221; header_4_font=&#8221;|600|||||||&#8221; custom_margin=&#8221;||15px||false|false&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{%22gcid-70ff693f-6f97-4074-be90-9adb196c4afe%22:%91%22header_3_text_color%22,%22header_3_text_color%22,%22header_2_text_color%22%93,%22gcid-49f96d57-8f93-4e8f-9dd7-a2d923a1dfd2%22:%91%22text_text_color%22%93}&#8221;]<\/p>\n<div class=\"references\">\n<p><a href=\"#_ednref1\" name=\"_edn1\"><span>[i]<\/span><\/a> See the AIVC study (Air Information and Ventilation Centre), available on the AFPVP website (data appears on page 2) &#8211;<br \/>\n    <a href=\"https:\/\/www.afpvp.fr\/wp-content\/uploads\/2024\/09\/VIP13_Ceiling_fans.fr-march-USA-2001.pdf\" target=\"_blank\" rel=\"noopener\"><br \/>\n      https:\/\/www.afpvp.fr\/wp-content\/uploads\/2024\/09\/VIP13_Ceiling_fans.fr-march-USA-2001.pdf<br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref2\" name=\"_edn2\"><span>[ii]<\/span><\/a> See the Pouget Consultants study based on the DPE database:<br \/>\n    <a href=\"https:\/\/ignes.fr\/storage\/2026\/06\/Analyse-de-la-base-de-donnees-DPE-au-regard-du-confort-dete-passif-2eme-edition-%E2%80%93-2026.pdf\" target=\"_blank\" rel=\"noopener\"><br \/>\n      https:\/\/ignes.fr\/storage\/2026\/06\/Analyse-de-la-base-de-donnees-DPE-au-regard-du-confort-dete-passif-2eme-edition-%E2%80%93-2026.pdf<br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref3\" name=\"_edn3\"><span>[iii]<\/span><\/a> These are robust estimates, but not yet published.<\/p>\n<p><a href=\"#_ednref4\" name=\"_edn4\"><span>[iv]<\/span><\/a> To access the Berkeley Guide:<br \/>\n    <a href=\"https:\/\/escholarship.org\/content\/qt6s44510d\/qt6s44510d.pdf?v=lg\" target=\"_blank\" rel=\"noopener\"><br \/>\n      https:\/\/escholarship.org\/content\/qt6s44510d\/qt6s44510d.pdf?v=lg<br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref5\" name=\"_edn5\"><span>[v]<\/span><\/a> The tool can be accessed here:<br \/>\n    <a href=\"https:\/\/cbe.berkeley.edu\/research\/advanced-ceiling-fan-design-tool\/\" target=\"_blank\" rel=\"noopener\"><\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"5LYpqw6TmR\"><p><a href=\"https:\/\/cbe.berkeley.edu\/research\/advanced-ceiling-fan-design-tool\/\">Advanced Ceiling Fan Design Tool<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Advanced Ceiling Fan Design Tool&#8221; &#8212; Center for the Built Environment\" src=\"https:\/\/cbe.berkeley.edu\/research\/advanced-ceiling-fan-design-tool\/embed\/#?secret=Z7pBs1Srq1#?secret=5LYpqw6TmR\" data-secret=\"5LYpqw6TmR\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref6\" name=\"_edn6\">[6]<\/a> More details:<br \/>\n    <a href=\"https:\/\/batiments-outremer.fr\/appels-a-projets-pour-des-batiments-ultramarins-economes-en-energie\/\" target=\"_blank\" rel=\"noopener\"><\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"WHKZJz6Pdz\"><p><a href=\"https:\/\/batiments-outremer.fr\/appels-a-projets-pour-des-batiments-ultramarins-economes-en-energie\/\">Projet B-AIR : guide technique brasseur d\u2019air<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u00ab\u00a0Projet B-AIR : guide technique brasseur d\u2019air\u00a0\u00bb &#8212; B\u00e2timents Outremer\" src=\"https:\/\/batiments-outremer.fr\/appels-a-projets-pour-des-batiments-ultramarins-economes-en-energie\/embed\/#?secret=HlT7JBcU2a#?secret=WHKZJz6Pdz\" data-secret=\"WHKZJz6Pdz\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref7\" name=\"_edn7\">[7]<\/a> Brise Guide:<br \/>\n    <a href=\"https:\/\/guide-brise.org\/le-guide\/\" target=\"_blank\" rel=\"noopener\"><\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"XMFWQDujN0\"><p><a href=\"https:\/\/guide-brise.org\/le-guide\/\">Le guide des brasseurs d&rsquo;air<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u00ab\u00a0Le guide des brasseurs d&rsquo;air\u00a0\u00bb &#8212; Le guide des brasseurs d&#039;air\" src=\"https:\/\/guide-brise.org\/le-guide\/embed\/#?secret=nkTfnS5cg9#?secret=XMFWQDujN0\" data-secret=\"XMFWQDujN0\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref8\" name=\"_edn8\">[8]<\/a> Brasse 1 is available on the ADEME library:<br \/>\n    <a href=\"https:\/\/librairie.ademe.fr\/energies\/6791-brasse.html#product-features\" target=\"_blank\" rel=\"noopener\"><br \/>\n      https:\/\/librairie.ademe.fr\/energies\/6791-brasse.html#product-features<br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref9\" name=\"_edn9\">[9]<\/a> The pre-layout tool can be downloaded here:<br \/>\n    <a href=\"https:\/\/guide-brise.org\/ressources\/\" target=\"_blank\" rel=\"noopener\"><\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"67um80B1lD\"><p><a href=\"https:\/\/guide-brise.org\/ressources\/\">Ressources<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u00ab\u00a0Ressources\u00a0\u00bb &#8212; Le guide des brasseurs d&#039;air\" src=\"https:\/\/guide-brise.org\/ressources\/embed\/#?secret=egHrwWFEG0#?secret=67um80B1lD\" data-secret=\"67um80B1lD\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref10\" name=\"_edn10\">[10]<\/a> See our article on blade height rules:<br \/>\n    <a href=\"https:\/\/www.brasseurs-air-re2020.com\/en\/re2020-what-are-the-rules-for-height-under-the-blades\/\"><\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"VIYN7dHBMO\"><p><a href=\"https:\/\/www.brasseurs-air-re2020.com\/re2020-quelles-regles-de-hauteur-sous-pales\/\">RE2020 : quelles r\u00e8gles de hauteur sous pales ?<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u00ab\u00a0RE2020 : quelles r\u00e8gles de hauteur sous pales ?\u00a0\u00bb &#8212; Brasseurs Air RE2020\" src=\"https:\/\/www.brasseurs-air-re2020.com\/re2020-quelles-regles-de-hauteur-sous-pales\/embed\/#?secret=GD1Hp828QX#?secret=VIYN7dHBMO\" data-secret=\"VIYN7dHBMO\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n    <\/a>\n  <\/p>\n<p><a href=\"#_ednref11\" name=\"_edn11\">[11]<\/a> In France, the notion of \u201cflush-mounted\u201d is not defined by an absolute distance as in the US (where the lowest blade point is \u2264 10 inches from the ceiling), but rather by a ratio (distance from ceiling to blade rotation plane) \/ (fan diameter). Based on this, for a \u00d8 1.32 m device, flush-mounted fans correspond to a blade-ceiling distance \u2264 20 cm.<\/p>\n<p><a href=\"#_ednref12\" name=\"_edn12\">[12]<\/a> American Society of Heating, Refrigerating and Air-Conditioning Engineers (US HVAC engineering association).<\/p>\n<p><a href=\"#_ednref13\" name=\"_edn13\">[13]<\/a> Found on p.12 of the Brasse 1 report &#8211; 3.2 Performance indicators for fans, section 2.3.2.<\/p>\n<\/div>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article presents the latest best practices for ceiling fan layout planning based on current knowledge and industry guidance. It explains key concepts such as cells, FCC (Coverage Comfort Factor), shape factor, required clearances, diameter selection, obstacle considerations, and the specific characteristics of Exhale models to help design high-performance installations that comply with RE2020 requirements.<\/p>\n","protected":false},"author":1,"featured_media":20823,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[65],"tags":[],"class_list":["post-21005","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-gb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ceiling Fan Layout Planning: Best Practices for Optimal Design - Brasseurs Air RE2020<\/title>\n<meta name=\"description\" content=\"Learn the best practices for 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