{"id":1589,"date":"2021-03-29T15:30:57","date_gmt":"2021-03-29T15:30:57","guid":{"rendered":"https:\/\/thetibble.com\/?p=1589"},"modified":"2024-01-05T07:32:47","modified_gmt":"2024-01-05T07:32:47","slug":"how-does-a-exhaust-fan-work","status":"publish","type":"post","link":"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/","title":{"rendered":"How Does a Bathroom Exhaust Fan Work"},"content":{"rendered":"<style>img#mv-trellis-img-1::before{padding-top:200%; }img#mv-trellis-img-1{display:block;}<\/style>\n<p>The purpose of a bathroom fan is to exhaust unwanted odors and moisture out of the house. The fan must be vented<a href=\"https:\/\/thetibble.com\/are-ductless-bathroom-fans-any-good\/\" data-lasso-id=\"1084\"> <em>because ductless bathroom fans do not remove moisture<\/em><\/a>, and should not be used in a bathroom with a shower.<\/p>\n\n\n\n<p><strong>An exhaust fan works by passing an electric current through the motor. This converts electrical energy to kinetic energy which in turn spins the fan impeller. As the impeller spins it sucks moist air from the bathroom and exhausts it out of the building via an insulated duct. <\/strong><\/p>\n\n\n\n<p>If you have recently bought a home, and are unsure if the fan actually vents out of the house, keep reading I have an easy tip how you can easily find out where it vents to. This will help prevent any further moisture damage and save you thousands over the long run.<\/p>\n\n\n\n<p><strong>The following is needed for an exhaust fan to work efficiently:<\/strong><\/p>\n\n\n\n<ul><li>Moist air must be vented <strong>out<\/strong> of the building envelope<\/li><li><a href=\"https:\/\/thetibble.com\/bathroom-fan-cfm-calculator\/\" data-lasso-id=\"1085\">Correct airflow (measured in Cubic feet per minute CFM)<\/a><\/li><li>The duct must be adequately sized and well designed<\/li><li><a href=\"https:\/\/thetibble.com\/should-exhaust-duct-be-insulated\/\" data-lasso-id=\"1086\">The duct should be insulated in almost all cases<\/a> to prevent condensation<\/li><li>Sufficient makeup air must be available<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Where Does the Exhausted Air End up<\/h2>\n\n\n\n<p><a href=\"https:\/\/thetibble.com\/does-a-bathroom-fan-need-to-vent-outside\/\" data-lasso-id=\"1087\">A bathroom fan <strong>should<\/strong> <strong><em>ALWAYS <\/em><\/strong>be vented to the outside<\/a>. This can be achieved by either running a duct from the bathroom fan <strong>through<\/strong> the ceiling, attic and finally terminating it either <strong>through<\/strong> the roof or <strong>through<\/strong> the soffit. <\/p>\n\n\n\n<p>Notice I said <strong>through<\/strong> everything not into. <strong>Not<\/strong> into the attic, <strong>not<\/strong> into the soffit.<\/p>\n\n\n\n<p><em>Venting a bathroom fan through a soffit is quite a controversial topic, some people say it should never be done, and others have done it for years without problems. <strong><a href=\"https:\/\/thetibble.com\/is-it-ok-to-vent-a-bathroom-fan-through-the-soffit\/\" data-lasso-id=\"1088\">There are some disadvantages, and advantages to terminating it to the soffit instead of the roof.<\/a><\/strong> As long as some basic rules are followed it will cause no issues.<\/em><\/p>\n\n\n\n<p>While bathroom fans <strong>should<\/strong> be always vented outside, this advice is <strong>not always followed.<\/strong> I have seen fans terminating in attics, garages, closed crawl spaces and even neighboring rooms.<\/p>\n\n\n\n<p>If you don&rsquo;t have access to the entire duct to check where it vents to, <strong>there is another way<\/strong>. While it requires some additional equipment, you will know for sure where the moist air is going.<\/p>\n\n\n\n<p>Use a <strong><em><a href=\"https:\/\/www.amazon.com\/dp\/B08H5D7GRM?tag=hvacbuzz-20\" data-lasso-id=\"1089\">smoke machine<\/a><\/em><\/strong><sub><sup>(amazon link)<\/sup><\/sub> to blow <strong>smoke<\/strong>* <strong>into<\/strong> the exhaust fan. While another person holds the smoke machine in front of the fan, go out and see if <strong>smoke<\/strong> <strong>comes<\/strong> <strong>out<\/strong> from any of the <strong>vents<\/strong>. <strong>If<\/strong> <strong>not<\/strong>, then check the attic, garage and the crawl space for smoke.  <\/p>\n\n\n\n<p>If it <strong>did not vent outside<\/strong>, there is probably a <strong>lot of moisture damage <\/strong>where ever it vented to.<\/p>\n\n\n\n<p><em>*the smoke from smoke machines is harmless, it is used usually for parties and can be inhaled.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Is CFM Important<\/h2>\n\n\n\n<div class=\"wp-block-image size-large\"><figure class=\"aligncenter\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"1024\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-512x1024.jpg\" alt=\"Bathroom exhaust fan airflow CFM chart\" class=\"wp-image-1887\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-512x1024.jpg 512w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-150x300.jpg 150w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-768x1536.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-735x1470.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-168x335.jpg 168w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-174x347.jpg 174w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-260x520.jpg 260w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-320x640.jpg 320w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-384x768.jpg 384w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-480x960.jpg 480w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-540x1080.jpg 540w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide.jpg 1000w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"eager\" decoding=\"async\" width=\"512\" height=\"1024\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20512%201024'%3E%3Crect%20width='512'%20height='1024'%20style='fill:%23e3e3e3'\/%3E%3C\/svg%3E\" alt=\"Bathroom exhaust fan airflow CFM chart\" class=\"wp-image-1887 eager-load\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide.jpg\" id=\"mv-trellis-img-1\" data-src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-512x1024.jpg.webp\" data-srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-512x1024.jpg.webp 512w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-150x300.jpg.webp 150w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-768x1536.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-735x1470.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-168x335.jpg.webp 168w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-174x347.jpg.webp 174w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-260x520.jpg.webp 260w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-320x640.jpg.webp 320w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-384x768.jpg.webp 384w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-480x960.jpg.webp 480w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide-540x1080.jpg.webp 540w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/05\/Bathroom-Fan-CFM-Guide.jpg.webp 1000w\" data-svg=\"1\" data-trellis-processed=\"1\"><\/figure><\/div>\n\n\n\n<p>The larger the bathroom, the higher capacity fan you need. <em>The Home Ventilating Institute recommends 8 air changes in an hour for a bathroom. <\/em>This means the larger the bathroom, the more powerful bathroom fan you need.<\/p>\n\n\n\n<p>The moisture quickly spreads in the room as soon as you turn on the shower. This makes it harder to exhaust the same amount of moisture from a large room compared to a small room. By using the <a href=\"https:\/\/thetibble.com\/bathroom-fan-cfm-calculator\/\" data-lasso-id=\"1090\"><strong><em>bathroom fan CFM calculator<\/em><\/strong><\/a> you can <strong>check<\/strong> to see if your bathroom fan is <strong>correctly sized<\/strong>. <em>+-20% from the calculated value is acceptable. <\/em>If <strong>buying<\/strong> a <strong>new<\/strong> <strong>fan<\/strong> always get one that is <strong>slightly<\/strong> <strong>more<\/strong> <strong>powerful<\/strong> than the calculator says.<\/p>\n\n\n\n<p>While eventually an undersized bath fan will exhaust all of the air, it will take much longer, and there is a high chance that<a href=\"https:\/\/thetibble.com\/bathroom-fan-not-removing-steam\/#Run_The_Fan_Longer\" data-lasso-id=\"1091\"><strong><em> people don&rsquo;t keep the fan running long enough.<\/em><\/strong><\/a><\/p>\n\n\n\n<p><strong>Quick tip:<\/strong> <em>If you are unsure the bath fan works at all, hold a tissue in front of it. The suction from the fan should easily hold it up. <\/em><a href=\"https:\/\/thetibble.com\/bathroom-fan-not-removing-steam\/\" data-lasso-id=\"1092\"><strong>Here are 7 reasons why a bathroom fan won&rsquo;t remove moisture<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Exhaust Duct<\/h2>\n\n\n\n<p>Nearly always a bathroom fan is connected to an air duct. While using a duct allows for the fan to be placed anywhere in the bathroom, care should be taken to keep the duct as short and straight as possible. <\/p>\n\n\n\n<p>The <strong>size<\/strong> of the <strong>duct<\/strong> should be <strong>correspond<\/strong> to the <strong>housing duct connection<\/strong> on the bathroom fan. <strong>Never smaller<\/strong>, <strong>even<\/strong> if the fan comes with an adapter. If the <strong>duct run<\/strong> is <strong>long<\/strong> and with many turns, <strong>go up one size<\/strong>. This means, if the fan housing has a 4-inch connection, you should run a 6-inch duct. <\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>There is no downside to a larger duct, but a duct that is undersized will waste energy and make the fan loud and inefficient.<\/p><\/blockquote><\/figure>\n\n\n\n<p><a href=\"https:\/\/thetibble.com\/should-exhaust-duct-be-insulated\/\" data-lasso-id=\"1093\">In almost all cases the duct should be insulated to prevent condensation inside the duct.<\/a> This will also prevent brown stains around the bath fan.<\/p>\n\n\n\n<p><a href=\"https:\/\/thetibble.com\/can-bathroom-exhaust-fans-be-installed-vertically\/\" data-lasso-id=\"1094\">Wall bathroom fans don&rsquo;t  generally have a duct<\/a>. They vent directly out of the exterior wall. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Makeup Air<\/h2>\n\n\n\n<p>Since the bathroom fan vents air out of the bathroom, fresh air must come in somewhere. <a href=\"https:\/\/thetibble.com\/bathroom-fan-not-removing-steam\/#Make_Sure_That_The_Door_Gap_Is_Sufficient\" data-lasso-id=\"1095\"><strong><em>The fresh air enters the bathroom generally through a gap under the door<\/em><\/strong><\/a>. In rare cases there could be a vent in the bathroom door for that purpose.<\/p>\n\n\n\n<p>If there is no gap under the door, the fan will have to fight very hard for every cubic feet of air. Since the air can not flow easily under the door it will be sucked through cracks in the door and walls. This creates a vacuum and will make the fan much less efficient.<\/p>\n\n\n\n<p><em>A 100 CFM bath fan needs a 6-inch duct. This means that the air that <strong>enters<\/strong> the bathroom must come from a <strong>opening<\/strong> that is <strong>as large<\/strong>, or larger than <strong>a 6-inch duct<\/strong>. This is very hard to accomplish without a gap under or vent in the door.<\/em><\/p>\n\n\n\n<p>By providing sufficient makeup air you could increase the bathroom fan performance up to 70 percent. Depending of course how airtight was the bathroom to begin with.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>Now that you know how it works, check out all the benefits of installing an exhaust fan by reading my article on the <a href=\"https:\/\/thetibble.com\/bathroom-fan-pros-and-cons\/\">pros and cons<\/a>. The pros definitely outweigh the cons!<\/p><\/blockquote><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Bathroom fan works by using an electric motor to spin an impeller blade. This blade sucks air from the bathroom and exhausts it out of the house envelope via air ducts. The duct is generally insulated to prevent condensation from forming in the duct and dripping back down into the bathroom. The entire ventilation system must be designed correctly in order for the bathroom fan to work as efficiently as possible.<\/p>\n\n\n\n<p>I hope you found this article helpful.<\/p>\n\n\n\n<p>Please vote and let me know how I can improve future articles.<\/p>\n\n\n\n<p>Thank you &#128578;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The purpose of a bathroom fan is to exhaust unwanted odors and moisture out of the house. The fan must be vented because ductless bathroom fans do not remove moisture, &hellip;<\/p>\n","protected":false},"author":59,"featured_media":1645,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"disable-in-feed":false,"article-schema-type":"","disable-critical-css":false,"footnotes":""},"categories":[16,8,9,7],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Does a Bathroom Exhaust Fan Work - The Tibble<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Does a Bathroom Exhaust Fan Work - The Tibble\" \/>\n<meta property=\"og:description\" content=\"The purpose of a bathroom fan is to exhaust unwanted odors and moisture out of the house. The fan must be vented because ductless bathroom fans do not remove moisture, &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/\" \/>\n<meta property=\"og:site_name\" content=\"The Tibble\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/thetibble\" \/>\n<meta property=\"article:published_time\" content=\"2021-03-29T15:30:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-01-05T07:32:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/04\/bathroom-fan-one-e1640252599303.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Michael Scott\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Scott\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/\"},\"author\":{\"name\":\"Michael Scott\",\"@id\":\"https:\/\/thetibble.com\/#\/schema\/person\/4d6ee0fd1370689dfd9e075a61cb6187\"},\"headline\":\"How Does a Bathroom Exhaust Fan Work\",\"datePublished\":\"2021-03-29T15:30:57+00:00\",\"dateModified\":\"2024-01-05T07:32:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/\"},\"wordCount\":1128,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/thetibble.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/04\/bathroom-fan-one-e1640252599303.jpg\",\"articleSection\":[\"Bathroom\",\"Bathroom Ventilation\",\"HVAC\",\"Ventilation\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/\",\"url\":\"https:\/\/thetibble.com\/how-does-a-exhaust-fan-work\/\",\"name\":\"How Does a Bathroom Exhaust Fan Work - 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