When you’re picking a new bathroom ventilation fan, you will often come across the term ‘CFM.’ An abbreviation for cubic feet per minute, CFM quantifies the amount of air that a fan can move. Larger bathrooms require fans with higher CFM ratings.
According to Fantech, the Home Ventilating Institute recommends 1 CFM per square foot in bathrooms up to 100 square feet. Larger bathrooms should be sized based on fixtures. All standard tubs, showers, and toilets require 50 CFM each. Large tubs and whirlpools need 100 CFM per fixture.
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