Bath Fans: Type - Ceiling; CFM - 110; Sones - 0.8; Grille Material - ABS; Grille Color - White; Housing/Grill Shape - Square; Housing Dimensions - 10.25x10.25x7.87"; Duct Size - 4" Round; Fan Grade - Low Noise; Additional Information - UL Listed Tub/Shower when used with GFCI. Continuous run totally enclosed motor, Built in Damper, Double bar hanger.; Manufacturer Series - WhisperCeiling