{"id":1377,"date":"2021-03-15T19:58:58","date_gmt":"2021-03-15T19:58:58","guid":{"rendered":"https:\/\/thetibble.com\/?p=1377"},"modified":"2024-01-05T07:32:57","modified_gmt":"2024-01-05T07:32:57","slug":"can-a-bathroom-fan-be-too-strong","status":"publish","type":"post","link":"https:\/\/thetibble.com\/can-a-bathroom-fan-be-too-strong\/","title":{"rendered":"Can a Bathroom Fan Be Too Strong"},"content":{"rendered":"<style>img#mv-trellis-img-1::before{padding-top:25%; }img#mv-trellis-img-1{display:block;}img#mv-trellis-img-2::before{padding-top:74.8046875%; }img#mv-trellis-img-2{display:block;}img#mv-trellis-img-3::before{padding-top:66.50390625%; }img#mv-trellis-img-3{display:block;}<\/style>\n<p>Ventilation is vital to prevent moisture damage in bathrooms. You might think that buying the strongest fan possible is best. But there are many reasons why this isn&rsquo;t true.<\/p>\n\n\n\n<p>The bathroom fan capacity should be matched to the size of the bathroom itself. A fan that is 20-30% stronger than this will exhaust the moist air slightly faster, but anything over that just causes a number of issues, including compromised fan efficiency.<\/p>\n\n\n<div class=\"lazyblock-nutshell-ZBQrGW wp-block-lazyblock-nutshell\"><p class=\"has-text-align-left has-text-color has-background\" style=\"background-color:#e7d1b1;color:#575f60;font-size:18px\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"150\" class=\"wp-image-3497\" style=\"width: 200px;\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png\" alt=\"\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png 600w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11-300x75.png 300w\" sizes=\"(max-width: 600px) 100vw, 600px\"><\/noscript><img loading=\"eager\" decoding=\"async\" width=\"600\" height=\"150\" class=\"wp-image-3497 eager-load\" style=\"width: 200px;\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20600%20150'%3E%3Crect%20width='600'%20height='150'%20style='fill:%23e3e3e3'\/%3E%3C\/svg%3E\" alt=\"\" sizes=\"(max-width: 600px) 100vw, 600px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png\" id=\"mv-trellis-img-1\" data-src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png.webp\" data-srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png.webp 600w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11-300x75.png.webp 300w\" data-svg=\"1\" data-trellis-processed=\"1\"><br><strong>Bathroom fans can be too strong. Removing too much air from the bathroom at a time can result in compromised exhaust efficiency, wasted energy, cold drafts, and backdrafting. In addition, high power fans are noisy.<\/strong> <\/p><\/div>\n\n\n<h2 class=\"wp-block-heading\">High Power Fans Will Be Noisier<\/h2>\n\n\n\n<p>Some people don&rsquo;t mind a loud bathroom fan. Without being crass, the noise of the fan can mask other noises. <\/p>\n\n\n\n<p>However, most people prefer quiet bathroom fans. There is no such thing as a peaceful, de-stress bath with a loudly humming exhaust fan. Moreover, bathrooms are often next or near bedrooms, so the noise from a loud bathroom fan can disturb sleep. <\/p>\n\n\n\n<p>A <a href=\"https:\/\/thetibble.com\/quiet-fan-sones\/\">whisper-quiet bathroom fan<\/a> is especially important for people who shower right before bed and find it difficult to fall asleep. If the fan is noisy, it would be more convenient to just turn it off immediately, which would be <a href=\"https:\/\/thetibble.com\/how-long-should-bathroom-fan-run-after-shower\/\" data-type=\"post\" data-id=\"3237\">too soon<\/a>.<\/p>\n\n\n\n<p>The general rule is that the more powerful the fan is, the more noise it will make. Firstly, the motor will be more powerful. Secondly, more air is being moved at a time, and moving air makes a noise.<\/p>\n\n\n\n<p>While there are whisper-quiet options for fans, this applies to the motor alone. The moving air from a high CFM fan will make considerable noise.<\/p>\n\n\n\n<p>Let&rsquo;s say you have used the <a data-lasso-id=\"959\" href=\"https:\/\/thetibble.com\/bathroom-fan-cfm-calculator\/\">CFM calculator<\/a> and found out that the optimal bathroom fan CFM for your bathroom is 110 cubic feet per minute (CFM). <\/p>\n\n\n\n<p>A quality <strong><em><a rel=\"nofollow noopener\" data-lasso-id=\"960\" data-lasso-name=\"Panasonic FV-0511VQC1 WhisperSense DC Ventilation Fan, 50-80-110 CFM\" href=\"https:\/\/www.amazon.com\/dp\/B076QNM3X8?tag=hvacbuzz-20\" target=\"_blank\">110 CFM fan<\/a><\/em><\/strong> <em><sub><sup>(amazon link)<\/sup><\/sub><\/em> will be almost silent. This particular fan I have linked to is rated at 0.3 sones. There is absolutely no way it will be heard in the next room. Compare that to the noise level of 2.9 sones for a 300 CFM fan. 2.9 sones is about 10 times louder than 0.3 sones.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p><a data-lasso-id=\"961\" href=\"https:\/\/thetibble.com\/how-are-bathroom-exhaust-fans-rated-guide-for-homeowners\/#What_is_a_Sone_Rating\">What are the sones I am talking about?<\/a><\/p><\/blockquote><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Compromised Exhaust Fan Efficiency<\/h2>\n\n\n\n<p>Bathroom fans have to be matched to the size of the bathroom because its function involves removing air from the room and replacing it with drier air.<\/p>\n\n\n\n<p>Stronger bathroom fans remove a larger percentage of the bathroom&rsquo;s total air volume per unit time. The result is that air leaves the bathroom faster than it can enter passively (which is what exhaust fans rely on to replace the exhausted air), and a vacuum forms inside the bathroom. <\/p>\n\n\n\n<p>The vacuum acts as a force of resistance against which the fan has to work. It makes it very difficult for more air to be pulled out of the bathroom.<\/p>\n\n\n\n<p>Since this is the purpose of the bathroom fan, it gets to a point where a larger fan makes the presence of the exhaust system pointless.<\/p>\n\n\n\n<p>In addition, once all the steam has been removed from the air, the bathroom fan has to remove the water that has condensed on the surfaces in the bathroom but it can only do this when the water evaporates into the air. <\/p>\n\n\n\n<p>A stronger fan does not increase the evaporation rate in any significant way.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Wasting Energy With Excessive Ventilation<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"766\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-1024x766.jpg\" alt=\"\" class=\"wp-image-1440\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-1024x766.jpg 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-300x225.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-768x575.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now.jpg 1200w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"766\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-1024x766.jpg.webp\" alt=\"\" class=\"wp-image-1440 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-1024x766.jpg.webp 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-300x225.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now-768x575.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now.jpg.webp 1200w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/save-energy-now.jpg\" id=\"mv-trellis-img-2\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p>Air is exhausted by a bathroom fan. This air has to be replaced. It&rsquo;s easy to just say that the air comes in through the gaps around the bathroom door. But where does this air come from? <\/p>\n\n\n\n<p>It comes from the other rooms in the house. Rooms that are supplied with HVAC cooled or heated air. <\/p>\n\n\n\n<p>When the air enters the bathroom, it gets saturated with water vapor from the running shower or bath and is subsequently pulled out of the bathroom to be replaced with more air from the rest of the house.<\/p>\n\n\n\n<p>What this means is that you are expending energy and money heating or cooling air that is just pulled out of the house and expelled to the outdoors. The air entering the house to replace this air has to be heated or cooled.<\/p>\n\n\n\n<p>This amounts to a waste of energy, so larger fans lead to higher utility bills and increased carbon footprints. <\/p>\n\n\n\n<p>Think of it like this. Let&rsquo;s say that outdoor temperature is 10 &deg;F (-12 &deg;C)&nbsp;and indoor temperature is kept at 74 &deg;F (23 &deg;C). <\/p>\n\n\n\n<p>Increasing the bathroom fan capacity by 100 CFM over what is recommended will rush an extra 100 cubic feet of 10 &deg;F (-12 &deg;C) air into the house.<\/p>\n\n\n\n<p>This will cool down the house and the heating system must work much harder to keep up and maintain the temperature set on the thermostat.<\/p>\n\n\n\n<p>The problem gets worse the longer and more often the fan is run. Of course, when the fan reaches the point at which a vacuum is created, the air inflow slows as well.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cold Drafts<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-1024x681.jpg\" alt=\"\" class=\"wp-image-1443\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-1024x681.jpg 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-300x200.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-768x511.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft.jpg 1200w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-1024x681.jpg.webp\" alt=\"\" class=\"wp-image-1443 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-1024x681.jpg.webp 1024w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-300x200.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft-768x511.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft.jpg.webp 1200w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/03\/cold-draft.jpg\" id=\"mv-trellis-img-3\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p>In the previous section, I spoke about the HVAC system having to heat the cold air entering the house to replace the excessive air removed by the overly large bathroom fan. <\/p>\n\n\n\n<p>The cold incoming air poses an additional problem. It&rsquo;s cold and it blows through your house!<\/p>\n\n\n\n<p>It&rsquo;s harder to do <em>everything<\/em> when you are cold, and if you are expending energy and money on heating the house, then you can add frustration to being cold.<\/p>\n\n\n\n<p>If the bathroom fan is reasonably powered the cold draft will be so small that it won&rsquo;t be noticeable. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Backdrafting<\/h2>\n\n\n\n<p>Backdrafting is another unfortunate side effect of the air pressure vacuum created by a fan that is too large for the size of the bathroom. <\/p>\n\n\n\n<p>Backdrafting affects exhaust systems and plumbing.<\/p>\n\n\n\n<p>Air that is supposed to be exhausted through range hoods, other bathroom fans, fireplace chimneys, and furnace vents is pulled back into the house to help balance the air pressure.<\/p>\n\n\n\n<p>Exhausted air is being removed from the house for a reason.<\/p>\n\n\n\n<ul>\n<li>Air laden with kitchen odors, grease, steam, and cooking by-products is pulled back into the kitchen from the range hood. These can pose a risk to your health and the state of your kitchen units and furniture.<\/li>\n\n\n\n<li>Steamy air from bathroom fans is pulled back into the bathrooms to fog up your mirrors, make your floors slippery, soak into wood, peel paint, etc. <\/li>\n\n\n\n<li>The by-products of fireplace and furnace fuel are supposed to be exhausted outside because they are toxic to human health.<\/li>\n<\/ul>\n\n\n\n<p>In addition, the air in plumbing drains and vents can also be pulled back into the house. Sewer gas is not only foul-smelling, it can also be toxic when inhaled.<\/p>\n\n\n\n<p>Backdrafting is less of a problem with old houses that were not built very airtight since energy costs were much lower compared to what they are today.<\/p>\n\n\n\n<p>This means that the fresh outdoor air is relatively easily pulled in through cracks in the windows frames and walls. This wastes a lot of energy, but in this case it will eliminate the risk of backdrafting.<\/p>\n\n\n\n<p>Modern homes, on the other hand, are built very airtight to meet strict energy efficiency standards, so backdrafting becomes a significant problem.<\/p>\n\n\n\n<p>If you are trying to replace a bathroom fan in a modern home with one that is much more powerful than the previous, consider adding an extra fresh air intake.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Things To Consider When Installing A Stronger Bath Fan<\/h2>\n\n\n\n<p>If you are still considering replacing your current bathroom fan with one that is <a href=\"https:\/\/thetibble.com\/best-high-cfm-bathroom-fans\/\" data-type=\"post\" data-id=\"782\">much more powerful<\/a>, there are some things that you need to keep in mind.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Duct Dimension<\/h3>\n\n\n\n<p>A higher capacity bathroom exhaust fan will need a larger duct.<\/p>\n\n\n\n<p>You can&rsquo;t just attach a 300 CFM bath fan to a 4&Prime; duct&mdash;well you could, but it will be loud, inefficient, and it won&rsquo;t achieve the specified CFM.<\/p>\n\n\n\n<p>Forcing too much air into a duct will negatively shift the balance between static pressure (friction) and velocity pressure (momentum), and the air will not flow through the ducts efficiently or even effectively.<\/p>\n\n\n\n<p>There is no point in connecting a high capacity bathroom fan to a small duct. If you don&rsquo;t want to replace the duct, it is best to just install a smaller bath fan instead.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Extra Fresh Air Vent<\/h3>\n\n\n\n<p>To eliminate the issues with an oversized fan, you can install fresh air intake vents.<\/p>\n\n\n<div class=\"lazyblock-amazonblock-10T8Or wp-block-lazyblock-amazonblock\">\n<div class=\"aawp\">\n\n            \n            \n<div class=\"aawp-product aawp-product--horizontal aawp-product--css-adjust-image-large\" data-aawp-product-asin=\"B003SXWSXI\" data-aawp-product-id=\"7923\" data-aawp-tracking-id=\"hvacbuzz-20\" data-aawp-product-title=\"Panasonic FV-GKF32S1 Passive Inlet Vent - Home &amp; Kitchen Air Vent\">\n\n    \n    <div class=\"aawp-product__thumb\">\n        <a class=\"aawp-product__image-link\" href=\"https:\/\/www.amazon.com\/dp\/B003SXWSXI?tag=hvacbuzz-20\" title=\"Panasonic FV-GKF32S1 Passive Inlet Vent - Home &amp; Kitchen Air Vent\" rel=\"nofollow noopener sponsored\" target=\"_blank\">\n            <noscript><img decoding=\"async\" class=\"aawp-product__image\" src=\"https:\/\/m.media-amazon.com\/images\/I\/31b15-S8NBL.jpg\" alt=\"Panasonic FV-GKF32S1 Passive Inlet Vent - Home &amp; Kitchen Air Vent\"><\/noscript><img decoding=\"async\" class=\"aawp-product__image lazyload\" src=\"https:\/\/m.media-amazon.com\/images\/I\/31b15-S8NBL.jpg\" alt=\"Panasonic FV-GKF32S1 Passive Inlet Vent - Home &amp; Kitchen Air Vent\" data-mvt-skip=\"src\" loading=\"lazy\" data-trellis-processed=\"1\">\n        <\/a>\n\n            <\/div>\n\n    <div class=\"aawp-product__content\">\n        <a class=\"aawp-product__title\" href=\"https:\/\/www.amazon.com\/dp\/B003SXWSXI?tag=hvacbuzz-20\" title=\"Panasonic FV-GKF32S1 Passive Inlet Vent - Home &amp; Kitchen Air Vent\" rel=\"nofollow noopener sponsored\" target=\"_blank\">\n            Panasonic FV-GKF32S1 Passive Inlet Vent - Home &amp; Kitchen Air Vent        <\/a>\n        <div class=\"aawp-product__description\">\n            <ul><li>Air Vent for Consistent Airflow: Balance indoor and outdoor air pressure and control air quality<\/li><li>Easy-Install Home Improvement: Has 4&rdquo; oval to 3&rdquo; round duct adapter for easy assembly<\/li><li>Air Vent Keeps Homes Clean: Comes with foam pad to reduce outdoor noise and condensation<\/li><li>Durable Air Vent Features for Use: Has a durable ABS and PP resin body; sturdy open and close lever<\/li><\/ul>        <\/div>\n    <\/div>\n\n    <div class=\"aawp-product__footer\">\n\n        <div class=\"aawp-product__pricing\">\n            \n                            <span class=\"aawp-product__price aawp-product__price--current\">$84.95<\/span>\n            \n                    <\/div>\n\n                <a class=\"aawp-button aawp-button--buy aawp-button aawp-button--blue rounded shadow aawp-button--icon aawp-button--icon-white\" href=\"https:\/\/www.amazon.com\/dp\/B003SXWSXI?tag=hvacbuzz-20\" title=\"Buy on Amazon\" target=\"_blank\" rel=\"nofollow noopener sponsored\">Buy on Amazon<\/a>\n            <\/div>\n\n<\/div>\n\n    \n<\/div>\n<p class=\"aawp-disclaimer\">Last update on 2024-03-30 \/ Affiliate links \/ Images from Amazon Product Advertising API<\/p><\/div>\n\n\n<p>While the amount of air entering through this designated point would be the same as the total amount pulled in through undesignated points without intake air vents, there are two main benefits to the fresh air vents: <\/p>\n\n\n\n<ol>\n<li>You can control the location of the incoming air so you don&rsquo;t have to have annoying drafts running past your bed or sitting area, for example. <\/li>\n\n\n\n<li>The air coming in can be conditioned with a heat exchanger or an air-to-air heat recovery system.<\/li>\n<\/ol>\n\n\n\n<p>Make sure that you don&rsquo;t install the intake vent right next to the bathroom fan or exhaust terminal vent as this would just circulate the air right in front of the fan and pull the exhausted air back into the bathroom, respectively.<\/p>\n\n\n\n<p>Generally, it is good to place a fresh air vent in the living area, such as the <strong>living room<\/strong> or the <strong>bedroom<\/strong>. This way the moist air will be sucked out by the bathroom fan, and the fresh air will come directly into the living area via the fresh air vent.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ventilation is vital to prevent moisture damage in bathrooms. You might think that buying the strongest fan possible is best. But there are many reasons why this isn&rsquo;t true. The &hellip;<\/p>\n","protected":false},"author":59,"featured_media":619,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":"","disable-in-feed":false,"article-schema-type":"","disable-critical-css":false},"categories":[16,8,9,7],"tags":[46,20,73],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Can a Bathroom Fan Be Too Strong - 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\/can-a-bathroom-fan-be-too-strong\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Can a Bathroom Fan Be Too Strong - The Tibble\" \/>\n<meta property=\"og:description\" content=\"Ventilation is vital to prevent moisture damage in bathrooms. 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