Flex Series 110 CFM Ceiling Roomside Installation Bathroom Exhaust Fan offers easy, room-side installation, with No Attic Access Required. Ceiling-mounted ventilation fan features foldable mounting ears and EZ Duct connector for easy installation. New duct damper technology provides a tighter seal, resulting in reduced warm and cold air backdrafts. This fan operates at 110 CFM and 3.0 Sones.