What Size Fan Do I Need For My Bathroom

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.

What size fan do i need for my bathroom. Run the fan for 15 to 20 minutes after. Never vent a bathroom fan directly into an attic it must always vent outside. Ceiling mount bathroom fans are the most common models.

10ft 10ft 8ft 7 5 106 67 cfm. This guide will help you understand how to choose the right size and type of bathroom fan. The effectiveness of the fan will be rated in cfm or cubic feet per minute of air moved.

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. A lower rating means a quieter fan. To be effective a bathroom fan needs to be powerful enough to completely replace the air in the room about 8 times every hour.

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. 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. For outdoor living spaces the necessary fan size will depend on the size and type of outdoor living area in which you are looking to place your fan.

For example a fan with a sone rating of 1 or less operates at about the sound level of a refrigerator. Cubic volume 7 5 cfm necessary. As you will see in the table above porches up to 144 square feet may only require a small ceiling fan while large gazeboes ranging in square footage from 225 to 400 may require a large ceiling.

Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. Here s how we get this number. Ft in the room.