Master Flow 0 CFM 0 Sones Whole House Fan Timer

The Master Flow 12 Hour Timer, when installed on Master Flow Belt Drive and Direct Drive Whole House Fans, can be set for any time from 10 minutes to up to 12 hours. When installing with Direct Drive Fan Model, you must have the BWS2 2 Speed Fan Control Switch as well. The timer knob and gray finish wall plate are included. For use with Master Flow belt drive and direct drive whole house fans Automatic operation from 10 minutes to 12 hours The timer automatically turns off when time has expired