NuTone 8814R Bath Fan, 110 CFM, 4.0 Sones 110 CFM 4.0 Sones Provides excellent ventilation for baths up to 105 square feet and dressing rooms-powder rooms-or other rooms for up to 135 square feet Grille of unbreakable Polymeric with white pebble finish Polypropylene centrifugal blower wheel is balanced for quiet operation Duct shoulder tapers to facilitate attachment of 4-Inch duct