What Size Bathroom Vent Fan Do I Need

If you are trying to replace a toilet call a plumber.

What size bathroom vent fan do i need.

You shouldn t need to calculate it by toilet size. According to hvi an easy approximation is to provide. The minimum allowed fan size is 50 cfm so if your bathroom is for example only 42 square feet you still need a 50 cfm fan. Ft in the room.

Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. Bathroom vent fans are rated by the cubic feet per minute cfm of air they move and should be sized to replace the air in the room at least eight times an hour. What is the minimum throughput rating for a vent fan. What minimum size cfm vent fan do i need per cubic foot of bathroom.

If your bathroom is 100 square feet or less you will need an extraction rate of at least 1cm3 per square foot of room area. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans. The cfm rating measures the volume of air the fan moves. While it won t be as effective as a fan with a proper cfm you can install a smaller fan directly above these fixtures for instance a 50 cfm fan above the toilet in order to satisfy a minimum need for ventilation.

Make sure the fan you choose is powerful enough to ventilate your bathroom. So for example if your bathroom is 54 metres square you will need a 54m3 hr fan. Use the room size to determine the necessary cubic feet per minute cfm rating of the fan. In order to know what size bathroom exhaust fan you need refer to the cm3 cubic metres squared measurement of your fan.

You do not want to diy a toilet. A large bathroom with a jetted tub a toilet and a shower a common configuration in new homes would need a 200 cfm ventilation fan such as the broan l200 ventilation fan available from. I want a vent fan that truly performs when it comes to removing moisture human methane etc. Consider a bathroom that is 10ft.

If your bathroom has an 8 ceiling the cfm rating for your fan should be as least as high as the number of square feet 5 x 7 35 sq. Surprisingly bathroom fans are not required by some building codes. Each toilet shower and bath tub needs about 50 cfm each while a jet tub needs 100 cfm. The home ventilating institute recommends that every bathroom have an adequate ventilation system that changes the air eight times an hour.

If you do something wrong that s a stinky mess sub floor damage waiting to happen.