What Size Exhaust Fan Do I Need For My Bathroom

Higher ceilings would require a larger fan.

What size exhaust fan do i need for my bathroom.

This keeps the moisture from the shower bath or sink from encouraging mold growth. Why you need a bathroom fan. Square feet is easy. The following table does lots of the math for you.

When installing a vent fan make sure there s at least a 1 2 gap under the bathroom door to allow fresh air to enter the room when the fan is running. The formula to calculate bathroom exhaust fan size reads as follows. The fan pulls air out of the bathroom and allows fresh air to be drawn in. Never vent a bathroom fan directly into an attic it must always vent outside.

A diameter of 4 inches. Simply enter the dimensions of your bathroom in the calculator below to determine the minimum size vent fan you need for the bathroom in your home. 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. Check the size of the exhaust port on the fan to make sure it fits your ductwork if applicable.

Tam asks what size exhaust fan should we use in our small bathroom if your bathroom has an 8 ceiling the cubic feet per minute cfm rating for your fan should be as high or higher than the number of square feet in the room. Bathroom extractor fans are mandatory in any bathroom without a window and still highly recommended in bathroom with windows. Why you need to have the proper size extractor fan. A bathroom fan is an essential piece of hardware in any indoor bathroom without a window.

Cubic volume 7 5 cfm necessary. Moist air from showers tubs and other fixtures in a bathroom can accumulate on bathroom surfaces leading to rot and peeling paint and providing a good environment for mold and mildew growth. Read on to find out more. This guide will help you understand how to choose the right size and type of bathroom fan.

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. Bathroom fans improve indoor air quality by venting moist air quickly outside which eliminates problems associated with high humidity like mold and mildew growth steamy mirrors and peeling wallpaper and paint. All you need to do is calculate the square feet of a room and the table tells you the cfm for either a kitchen or bathroom. Handy table for fan values.