PNS1116 Features: * Bathroom fan * Detachable adaptors * Friendly installation * CFM technology * Built-in damper to prevent back draft * Loose fill or battery insulation * Motor bearing type: Ball * Thermal fuse protection * Blower wheel type: Sirocco * Incorporate DC motor in residential mechanical ventilation fans * ISO 9001 certified * Energy star * Mounting opening (inches sq.): 101/2"" * Duct diameter: 4"" or 6"" * Grille size (inches sq.): 13"" Construction: * Engineered for trouble-free, continuous run for several years Dimensions: * Overall dimensions:11.25"" H x 14.25"" W x 16.75"" D Collection: * Whisper Green collection