added by lindafmg
(8 days ago)
50: The number of CFMs (cubic feet per minute of air changes) most codes require as a minimum in bath fans. Getting exactly the right number of CFMs for your bath involves calculating the volume of the room and the length of the ductwork. There are charts available online to help with this calculation. Add some bells and whistles to that fan with timers, humidity-sensing controls and other features.