What Size Bathroom Vent Fan Do I Need

Surprisingly bathroom fans are not required by some building codes.

What size bathroom vent fan do i need.

Each toilet shower and bath tub needs about 50 cfm each while a jet tub needs 100 cfm. What minimum size cfm vent fan do i need per cubic foot of bathroom. Make sure the fan you choose is powerful enough to ventilate your bathroom. The home ventilating institute recommends that every bathroom have an adequate ventilation system that changes the air eight times an hour.

If you are trying to replace a toilet call a plumber. Use the room size to determine the necessary cubic feet per minute cfm rating of the fan. In those areas ventilation in bathrooms is required but it can be from a window or fan your choice. 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 you do something wrong that s a stinky mess sub floor damage waiting to happen. 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. Ft in the room.

Consider a bathroom that is 10ft. The cfm of the bathroom will account for the toilet. 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. I want a vent fan that truly performs when it comes to removing moisture human methane etc.

What is the minimum throughput rating for a vent fan. You do not want to diy a toilet. 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. 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.

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 cfm rating measures the volume of air the fan moves. So for example if your bathroom is 54 metres square you will need a 54m3 hr fan. You shouldn t need to calculate it by toilet size.

In order to know what size bathroom exhaust fan you need refer to the cm3 cubic metres squared measurement of your fan.