Flex Series 80 Cfm Ceiling Roomside Installation Bathroom Exhaust Fan, Energy Star* Enjoy Easy Exhaust Bath Fan Installation With The Flex Series 80 Cfm Ceiling Exhaust Bath Fan, Energy Star. Room Side Installation Eliminates The Need For Attic Access. This Ceiling-Mounted Ventilation Fan Features Foldable Mounting Ears And An Ezduct Connector For A Fast And Simple Installation. New Duct Damper Technology Provides A Tighter Seal, Resulting In Reduced Warm And Cold Air Backdrafts. Operating Capabilities Allow This Fan To Run At A Powerful 80 Cfm And A Quiet 1.2 Sones For A Smooth Run. This Quality Fan Is Also Designed To Keep Odor, And Mildew At Bay With Humidity Reducing Features.