{"id":88051,"date":"2026-10-26T14:23:51","date_gmt":"2026-10-26T14:23:51","guid":{"rendered":"https:\/\/www.vevor.com\/diy-ideas\/?p=88051"},"modified":"2026-10-27T02:34:23","modified_gmt":"2026-10-27T02:34:23","slug":"what-size-attic-fan-do-i-need-cfm-chart-guide","status":"publish","type":"post","link":"https:\/\/www.vevor.com\/diy-ideas\/what-size-attic-fan-do-i-need-cfm-chart-guide\/","title":{"rendered":"What size fan do I need for my attic? A Simple Size Guide","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>If your upstairs rooms remain hot, your roof space is trapping excessive heat. Homeowners often ask, \u201cWhat size attic fan do I need?\u201d especially when choosing a<a href=\"https:\/\/www.vevor.com\/gable-mount-attic-fan-c_42285\"> gable attic fan<\/a> for 2000 sq ft house setups.<\/p><p>To choose the right system, it helps to understand what <a href=\"https:\/\/www.vevor.com\/diy-ideas\/attic-fan-benefits-what-they-do-and-when-theyre-worth-it\/\">benefits an attic fan<\/a> offers: how it pushes out superheated air while drawing in cooler outdoor air. Mounting a gable-mount attic fan in a suitable gable opening can help exhaust hot attic air without requiring a roof-mounted installation. Following the proper <a href=\"https:\/\/www.vevor.com\/diy-ideas\/gable-attic-fan-installation-step-by-step-diy-guide-2026\/\">steps for installing a gable fan<\/a> ensures efficient airflow and prevents the fan from drawing conditioned air out of your home.<\/p><div class=\"wp-block-ht-block-toc is-style-rounded htoc htoc--position-wide toc-list-style-plain\" data-htoc-state=\"expanded\" data-htoc-scrollspy=\"false\" data-htoc-auto-collapse=\"true\" data-htoc-mapping-headers=\"[false,true,false,false,false,false]\"><span class=\"htoc__title\"><span class=\"ht_toc_title\">Table of Contents<\/span><span class=\"htoc__toggle\"><\/span><\/span><div class=\"htoc__itemswrap\"><ul class=\"ht_toc_list\"><li class=\"\"><a href=\"#h-how-do-i-choose-the-best-attic-fan-size-for-my-attic\">How Do I Choose the Best Attic Fan Size for My Attic?<\/a><\/li><li class=\"\"><a href=\"#h-size-of-attic-fan-cfm-chart-by-size-of-attic\">Size of Attic Fan: CFM Chart by Size of Attic<\/a><\/li><li class=\"\"><a href=\"#h-attic-fan-ventilation-requirements-and-fan-count\">Attic Fan Ventilation Requirements and Fan Count<\/a><\/li><li class=\"\"><a href=\"#h-which-vevor-attic-fan-model-is-best-for-my-attic-size\">Which VEVOR Attic Fan Model Is Best for My Attic Size?<\/a><\/li><li class=\"\"><a href=\"#h-faqs\">FAQs<\/a><\/li><\/ul><\/div><\/div><h2 class=\"wp-block-heading\" id=\"h-how-do-i-choose-the-best-attic-fan-size-for-my-attic\">How Do I Choose the Best Attic Fan Size for My Attic?<\/h2><p>When you\u2019re sizing a fan, CFM (cubic feet per minute) is a helpful place to start. It tells you how much air the fan can move. Use this method to figure out what size attic fan I need for a new home or a replacement.<\/p><h3 class=\"wp-block-heading\" id=\"h-step-1-measure-the-attic-floor\">Step 1. Measure the attic floor.<\/h3><p>Measure the attic length and width. One thousand square feet is 50 feet by 30 feet. In a one-story house, the attic floor area is usually close to the home&#8217;s footprint, though the exact sizes may be different.<\/p><h3 class=\"wp-block-heading\" id=\"h-step-2-use-the-cfm-per-square-foot-rule\">Step 2. Use the CFM-Per-Square-Foot Rule<\/h3><p>0.7 CFM per square foot is a rough guess that is sometimes used to figure out the size of an attic fan. How many CFM for attic fan that&#8217;s 1,500 square feet? To get 1,050 CFM, multiply 1,500 by 0.7.<\/p><p>This number for the CFM of an attic fan per square foot should only be used as a guide. The right airflow depends on how the attic is built, the climate, the type of ventilation that is already there, and the fan that is being installed. A hotter climate or a dark roof may make heat build up faster, but that doesn&#8217;t mean you should choose a bigger fan without first checking how much airflow you need.<\/p><p>Please note that fan ratings may not guarantee consistent airflow in every installation setting. Louvers, screens, ductwork, and other things that block airflow can actually change how well something works. Check the specs of the VEVOR model you&#8217;re thinking about against the amount of airflow you need.<\/p><figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-12.png!webp\" alt=\"Attic fan helps move air out of the attic or bring fresh air in\" class=\"wp-image-88053\" srcset=\"https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-12.png!webp 800w, https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-12-300x169.png!webp 300w, https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-12-768x432.png!webp 768w, https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-12-600x338.png!webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><h3 class=\"wp-block-heading\" id=\"h-step-3-check-the-air-vents-for-intake\">Step 3: Check the air vents for intake<\/h3><p>A fan can only push air out of the attic and let it flow into it. Make sure that your soffit or other low-level air intakes can provide enough air. If there isn&#8217;t enough intake airflow, the fan might not work as well and may pull conditioned air out of your home through gaps in the roof.<\/p><p>Look for things blocking the vents, like insulation that&#8217;s covering the openings in the soffits. Before installing, make sure you follow the ventilation guidelines provided by the fan&#8217;s maker and any building rules that apply.<\/p><h3 class=\"wp-block-heading\" id=\"h-step-4-connect-a-fan-to-a-number\">Step 4: Connect a fan to a number<\/h3><p>The rated CFM of the fan should match the amount of airflow needed in your attic, and the mounting dimensions and installation instructions should fit the space. There are different airflow values for gable-mount attic fans, so you can compare them based on your needs.<\/p><p>Some listings for <a href=\"https:\/\/www.vevor.com\/solar-fan-c_44488\">solar attic fans<\/a> also give an estimate of coverage in square feet. Use that number as a reference provided by the manufacturer, not as a promise that the fan will adequately ventilate every attic. You can use this <a href=\"https:\/\/www.vevor.com\/diy-ideas\/attic-gable-fan-with-thermostat-sizing-features-buyers-guide\/\">size and features buyer&#8217;s guide <\/a>to find the best fan type and settings for your needs.<\/p><p>VEVOR also has gable attic fan installation demo videos; for example, check the exhaust fan with shutter step-by-step guide:<\/p><figure class=\"wp-block-embed is-type-video is-provider-tiktok wp-block-embed-tiktok wp-embed-aspect-9-16 wp-has-aspect-ratio\">\n<iframe height=\"578\" width=\"325\" src=\"https:\/\/www.tiktok.com\/player\/v1\/7403798433011698986?embed_from=oembed&#038;music_info=1&#038;description=1&#038;autoplay=1&#038;muted=1\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; fullscreen; gyroscope; picture-in-picture; web-share\" allowfullscreen loading=\"lazy\"><\/iframe>\n<\/figure><h2 class=\"wp-block-heading\" id=\"h-size-of-attic-fan-cfm-chart-by-size-of-attic\">Size of Attic Fan: CFM Chart by Size of Attic<\/h2><p>For quick help, use this attic fan chart to find the right size. It uses a rough estimate of 0.7 CFM per square foot to estimate the airflow so you can see what size attic fan do I need at a glance.<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Attic Floor illustrative Area<\/strong><\/th><th><strong>Target CFM<\/strong><\/th><th><strong>Typical Fan Size<\/strong><\/th><th><strong>Best For<\/strong><\/th><\/tr><\/thead><tbody><tr><td>800 sq ft<\/td><td>560<\/td><td>10 to 12 in<\/td><td>Small homes, sheds<\/td><\/tr><tr><td>1,500 sq ft<\/td><td>1,050<\/td><td>12 in, about 1,500 CFM<\/td><td>Typical single-story attics<\/td><\/tr><tr><td>2,000 sq ft<\/td><td>1,400<\/td><td>12 to 14 in, 1,500 to 2,000 CFM<\/td><td>Larger single-story homes<\/td><\/tr><tr><td>3,000 sq ft<\/td><td>2,100<\/td><td>16 in, about 2,900 CFM<\/td><td>Big attics, garages<\/td><\/tr><tr><td>6,000 sq ft<\/td><td>4,200<\/td><td>20 in, about 4,800 CFM<\/td><td>Workshops, barns<\/td><\/tr><\/tbody><\/table><\/figure><p>To read the attic fan size chart, determine your attic&#8217;s floor area, find the expected CFM for that area, and compare it with the fan&#8217;s measured airflow. If your attic is in the middle of two rows, figure out how big it is instead of picking the bigger fan. Check the final size suggestion against the fan&#8217;s manufacturer&#8217;s instructions and the ventilation needs of your attic.<\/p><div id=\"vevor-goods-card-container_1\"><h2>Recommended For Your Project<\/h2><\/div><h3 class=\"wp-block-heading\" id=\"h-what-size-attic-fan-do-you-need-for-a-2-000-square-foot-house\">What Size Attic Fan Do You Need for a 2,000-Square-Foot House?<\/h3><p>The right attic fan for a 2,000 sq ft house depends on the attic&#8217;s size. The attic floor area of a one-story house might be around 2,000 square feet, which gives us a rough estimate of 1,400 CFM using the 0.7 formula.<\/p><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-1.png!webp\" alt=\"Close-up of an attic fan blade and motor at a 2000 sq ft house\" class=\"wp-image-88054\" srcset=\"https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-1.png!webp 800w, https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-1-300x169.png!webp 300w, https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-1-768x432.png!webp 768w, https:\/\/i.vevor.net\/wp-content\/uploads\/2026\/10\/Gable-attic-exhaust-fan-for-ventilation-1-600x338.png!webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><p>A two-story house with the same overall living space might have an attic that&#8217;s about 1,000 square feet, which would mean about 700 CFM. These numbers are just examples; they don&#8217;t prove that you need this much ventilation. Don&#8217;t use the home&#8217;s total floor space to estimate attic size.<\/p><h2 class=\"wp-block-heading\" id=\"h-attic-fan-ventilation-requirements-and-fan-count\">Attic Fan Ventilation Requirements and Fan Count<\/h2><p>Good Attic fan ventilation requirements start with enough air intake. A general rule of thumb is to have about 1 square foot of net-free intake vent area for every 300 CFM of exhaust airflow. However, the exact ratio will rely on the ventilation system and what the manufacturer says.<\/p><p>The intake vent area is not the same as the attic floor area. They measure different things. When you take out screens, louvers, and other things that get in the way, the part of a vent that actually lets air flow is called the net-free area.<\/p><p>For attic fan ventilation requirements, you must also keep the soffit vents free of insulation and make sure that the intake and exhaust openings work together. Check the fan&#8217;s instructions and your local building codes. How the main fan types fit together is covered in this <a href=\"https:\/\/www.vevor.com\/diy-ideas\/attic-ventilation-fans-b_10557\/\">attic ventilation buying guide<\/a>.<\/p><h2 class=\"wp-block-heading\" id=\"h-which-vevor-attic-fan-model-is-best-for-my-attic-size\">Which VEVOR Attic Fan Model Is Best for My Attic Size?<\/h2><p>Which VEVOR attic fan type is ideal for your attic? Match your estimated airflow with the specifications of the fan you plan to install. VEVOR makes<a href=\"https:\/\/www.vevor.com\/gable-mount-attic-fan-c_42285\"> gable-mount attic fans<\/a> and wall-mounted shutter exhaust fans, but they&#8217;re installed differently and meant for different uses. Instead of thinking of all vent fans as being the same, pick one that is especially made for your installation.<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Model<\/strong><\/th><th><strong>Airflow<\/strong><\/th><th><strong>Motor and Controls<\/strong><\/th><th><strong>Best Attic Size<\/strong><\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.vevor.com\/exhaust-fan-c_11519\/vevor-12-in-shutter-exhaust-fan-with-smart-programming-controller-wall-mount-p_010719504800\">12 inch smart shutter fan<\/a><\/td><td>1,500 CFM<\/td><td>EC motor, variable speed, timer<\/td><td>Up to about 2,150 sq ft<\/td><\/tr><tr><td><a href=\"https:\/\/www.vevor.com\/exhaust-fan-c_11519\/vevor-14-in-shutter-exhaust-fan-with-smart-programming-controller-wall-mount-p_010305684566\">14 inch smart shutter fan<\/a><\/td><td>2,000 CFM<\/td><td>EC motor, variable speed, timer<\/td><td>Up to about 2,850 sq ft<\/td><\/tr><tr><td><a href=\"https:\/\/www.vevor.com\/exhaust-fan-c_11519\/vevor-16-in-shutter-exhaust-fan-with-smart-programming-controller-wall-mount-p_010947111174\">16 inch smart shutter fan<\/a><\/td><td>2,900 CFM<\/td><td>EC motor, variable speed, timer<\/td><td>Up to about 4,150 sq ft<\/td><\/tr><tr><td><a href=\"https:\/\/www.vevor.com\/exhaust-fan-c_11519\/vevor-20-inch-shutter-exhaust-fan-wall-mounted-attic-vent-fan-with-smart-programming-variable-speed-temperature-control-4800-cfm-ec-motor-timer-for-shed-garage-greenhouse-ventilation-cooling-black-p_010884265982\">20 inch smart shutter fan<\/a><\/td><td>4,800 CFM<\/td><td>EC motor, variable speed, timer<\/td><td>Up to about 6,850 sq ft<\/td><\/tr><tr><td><a href=\"https:\/\/www.vevor.com\/exhaust-fan-c_11519\/vevor-36-inch-shutter-exhaust-fan-wall-mounted-attic-vent-fan-with-11000-cfm-airflow-ac-motor-heavy-duty-steel-construction-low-noise-for-shed-garage-greenhouse-ventilation-cooling-silver-p_010125068302\">36 inch shutter exhaust fan<\/a><\/td><td>11,000 CFM<\/td><td>AC motor, heavy-duty steel<\/td><td>Up to about 15,700 sq ft<\/td><\/tr><\/tbody><\/table><\/figure><p>Verify the exact model and current product specs before publishing or buying, since configurations can be different.<\/p><p>Using this guide&#8217;s illustrative 0.7 CFM-per-square-foot estimate, an attic fan for 2,000 sq ft house would calculate to 1,400 CFM. This figure is a starting point, not a final fan recommendation. The estimates for the 1,300 CFM models are a little lower than that, while the estimates for the 2,940 CFM models are higher. That comparison doesn&#8217;t tell you which fan is best; you also need to check the manufacturer&#8217;s size recommendations, the amount of input airflow, the fan&#8217;s ability to be mounted, and the attic&#8217;s real needs.<\/p><p>These gable-mount alternatives are intended for use in a suitable gable opening. Wall-mounted <a href=\"https:\/\/www.vevor.com\/diy-ideas\/vevor-shutter-exhaust-fan\/\">shutter exhaust fans<\/a> are a different product type, so make sure you understand what they&#8217;re meant to do and how to mount them before you choose one for your attic. Once you&#8217;ve chosen a model that works for you, look at the <a href=\"https:\/\/www.vevor.com\/diy-ideas\/attic-ventilation-fans-b_10557\/\">VEVOR exhaust fan installation guide<\/a> that comes with it.<\/p><h2 class=\"wp-block-heading\" id=\"h-summary\">Summary<\/h2><p>So,&nbsp; what size attic fan do I need? The answer is: First, measure your attic. Then, use the right ventilation-sizing method to guess how much airflow you&#8217;ll need. Finally, compare that number to the fan&#8217;s rated CFM. The number 0.7 CFM\/square foot used in this guide is just a rough guess and not a hard-and-fast rule. It is also important to have enough intake ventilation.<\/p><p>Compare the expected airflow for popular attic sizes on the chart. Then, look at the VEVOR model specs to narrow down your choices. <a href=\"https:\/\/www.vevor.com\/gable-mount-attic-fan-c_42285\">VEVOR&#8217;s attic fans<\/a> and wider ventilation range come in a variety of mounting styles and airflow sizes, so choose a model that fits your installation and ventilation needs.<\/p><h2 class=\"wp-block-heading\" id=\"h-faqs\">FAQs<\/h2><h3 class=\"wp-block-heading\" id=\"h-how-do-i-choose-the-right-size-of-window-or-attic-fan-for-my-space\">How do I choose the right size of window or attic fan for my space?<\/h3><p>The size of an attic fan relies on how much airflow is needed in the attic, the fan&#8217;s CFM rate, and the airflow that can enter the attic. The 0.7 CFM-per-square-foot calculation can give you a rough idea, but it shouldn&#8217;t be used instead of the manufacturer&#8217;s size recommendations.<\/p><p>Window fans are selected according to the window opening and the intended application. Do not just assume that a VEVOR shutter exhaust fan can be installed in a window; read the product&#8217;s fitting directions first.<\/p><h3 class=\"wp-block-heading\" id=\"h-in-a-hot-place-how-many-cfm-should-an-attic-fan-have\">In a hot place, how many CFM should an attic fan have?<\/h3><p>A rough estimate of 0.7 CFM per square foot can help you compare airflow needs, but the exact capacity you need depends on your attic&#8217;s construction, climate, ventilation openings, and the fan manufacturer&#8217;s recommendations. The first guess is that an attic that&#8217;s 1,500 square feet will need 1,050 CFM. See if this estimate matches up with good fan models, and make sure your final choice meets the ventilation needs.<\/p><h3 class=\"wp-block-heading\" id=\"h-what-are-the-differences-between-14-and-15-inch-attic-fans\">What are the differences between 14 and 15 inch attic fans?<\/h3><p>The only differences between sizes are in the overall size of the fan and any possible impact on airflow. A 15-inch fan can have a larger blade diameter but it may not deliver more CFM than a 14-inch fan. Compare airflow, motor efficiency, noise, and installation dimensions before making a selection.<\/p><h3 class=\"wp-block-heading\" id=\"h-how-do-i-choose-the-right-attic-fan-for-my-home\">How do I choose the right attic fan for my home?<\/h3><p>First, measure your attic and estimate how much airflow it needs. Find the fan&#8217;s CFM rating and compare it to the amount of airflow you need. Next, look at the mounting type, power needs, controls, and intake ventilation. Always make sure you know exactly what a product does before you buy it.<\/p><h3 class=\"wp-block-heading\" id=\"h-should-you-always-get-a-bigger-attic-fan\">Should you always get a bigger attic fan?<\/h3><p>Not at all. If the attic doesn&#8217;t have enough air circulation, a bigger fan isn&#8217;t always better. If you don&#8217;t let enough air in, it can block airflow and cause too much negative pressure, which could pull conditioned air out of the room.<\/p><p>Pick a fan that fits the ventilation needs of your attic, check to see how much air it can pull in, and install it according to the manufacturer&#8217;s instructions before adding more fans.<\/p><p><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>If your upstairs rooms remain hot, your roof space is trapping excessive heat. Homeowners often ask, \u201cWhat size attic fan [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":4,"featured_media":88052,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[6311,6314],"tags":[13179,13180,13178,13176],"class_list":["post-88051","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-home","category-house-maintenance","tag-attic-fan-cfm","tag-attic-fan-size-calculator","tag-attic-fan-sizing","tag-attic-ventilation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.3 (Yoast SEO v25.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Size Attic Fan Do I Need? 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