What Size Exhaust Fan Do I Need For My Bathroom

Never vent a bathroom fan directly into an attic it must always vent outside.

What size exhaust fan do i need for my bathroom.

The fan pulls air out of the bathroom and allows fresh air to be drawn in. 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. Click here to get free fast bids from local contractors that install ventilation fans. Square feet is easy.

This guide will help you understand how to choose the right size and type of bathroom fan. The following table does lots of the math for you. 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. 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.

Read on to find out more. This keeps the moisture from the shower bath or sink from encouraging mold growth. Cubic volume 7 5 cfm necessary. Higher ceilings would require a larger fan.

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. Bathroom fan exhaust size calculator. A bathroom fan is an essential piece of hardware in any indoor bathroom without a window. Handy table for fan values.

Why you need to have the proper size extractor fan. Why you need a bathroom fan. 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. 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.

Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. 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. Check the size of the exhaust port on the fan to make sure it fits your ductwork if applicable. A diameter of 4 inches.