How to Size a Bathroom Exhaust Fan: CFM Rules, Noise Ratings, and Ducting
Bathroom exhaust fans are required by the National Electrical Code (NEC) and local building codes for any bathroom that lacks an openable window, and some jurisdictions require them even when windows are present. The fan has one job: pull humid air out before it condenses on walls, ceilings, and grout lines. An undersized fan fails […]
