Air Vent Inc. 36' Whole House Fan 54508 Attic & Whole House Fans

The 36" belt drive whole house fan (6900 CFM) with automatic shutter helps cool living spaces up to 2300 square feet. It runs on high & low and a 2 speed wall switch is included. The automatic shutter is white. It needs 1325 square inches of open exhaust vents in attic space. The rough opening is 34-1/4" x 36-3/4". You do have to cut joist when installing fan, with motor mounted on struts above housing. The fan will be quieter than direct drive models. It has a 10 year limited parts warranty and a 5 year limited labor warranty.