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.

In those areas ventilation in bathrooms is required but it can be from a window or fan your choice. In order to know what size bathroom exhaust fan you need refer to the cm3 cubic metres squared measurement of your fan. Consider a bathroom that is 10ft. A fan that s too small won t remove moisture and odors efficiently and will need to run longer increasing wear on the motor.

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. 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. 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. You shouldn t need to calculate it by toilet size.

So for example if your bathroom is 54 metres square you will need a 54m3 hr fan. 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. 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. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.

Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. The home ventilating institute recommends that every bathroom have an adequate ventilation system that changes the air eight times an hour. The cfm rating measures the volume of air the fan moves. Surprisingly bathroom fans are not required by some building codes.

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. Use the room size to determine the necessary cubic feet per minute cfm rating of the fan. Each toilet shower and bath tub needs about 50 cfm each while a jet tub needs 100 cfm. What is the minimum throughput rating for a vent fan.

You do not want to diy a toilet. If you do something wrong that s a stinky mess sub floor damage waiting to happen. What minimum size cfm vent fan do i need per cubic foot of bathroom. The cfm of the bathroom will account for the toilet.

Ft in the room.