![]() ![]() The minimum recommendation is a fan rated at least 45 CFM. ![]() To find the square footage, multiply the length of the bathroom by the width sq.ft. 3 PC AC Motor Models PCD DC Motor Models PCV Value Series Models PCLP Low Profile Models PCRL Recessed Vent Light Models 3Ĥ Bathroom Fan Sizing Based on the Home Ventilating Institute (HVI) guidelines: FAN SIZING FOR BATHROOMS UNDER 100 SQUARE FEET The standard rule for bathrooms 100 square feet or smaller is one CFM per square foot of the bathroom.
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