# How To Calculate Cfm For Bathroom

### Ventilation for baths over 100 square feet is calculated based on the fixtures in the bathroom.

How to calculate cfm for bathroom. You can easily use the following equation to do so to calculate the air change in a room the airflow is measured cfm and multiplied by 60 minutes per hour. Measure the room s width and length. The higher the bath fan rating the more air can be vented out of the bathroom which means less moisture and mold build up. For a rectangular bathroom this is done by multiplying the width and.

Sizing for large bathrooms. Next use your dimensions to calculate the total volume of your bathroom. How to calculate the cfm of a room step 1. Choosing the right cfm size for a bathroom exhaust fan standard fan sizing.

For standard square or rectangular bathrooms. For bathrooms over 100 square feet exhaust fans can be sized according to the number of. Press calculate minimum suggested bath fan cfm. How to calculate the cfm of a bathroom fan step 1.

Measure the dimensions of your bathroom. It is then divided by the volume of the room you wish to measure in cubic feet. The standard rule for bathrooms 100 square feet or smaller is one cfm per square foot of the bathroom. First you have to measure your bathroom dimensions to calculate room volume length x width x height of the room feet divide the number of feet by 60 minutes fans are sized based on the number of recommended air exchanges per hour 60 minutes.

Divide the volume of your bathroom in feet by 7 5. Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour. 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 result is the cfm or cubic feet per minute rating.

Air changes hr cfm x 60 minutes volume of the room cubic feet. Calculate the floor area of your bathroom. Calculate the total volume of your bathroom. Also measure the height of the room from the ceiling to the floor.

That s why we developed this handy bathroom vent fan cfm calculator. Fan sizing for bathrooms over 100 sq. Multiply the cubic. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom.

Multiply the three measurements from step 1 to determine the cubic footage of the room. Bathroom vent fans are rated for the amount of air they can move measured in cubic feet per. For instance if a room. How to size an exhaust fan for a bathroom measure the dimensions of your bathroom.

Use a tape measure to measure the length width and height of your bathroom. Use a tape measure to measure each dimension of your bathroom the length. When installing a vent fan make sure there s at least a 1 2 gap under the bathroom door.