Incredibly reliable. Unbelievably quiet. Offering the CFM choices you need at the lowest sound levels in the industry.Low RPM for quiet operation Resilient anti-vibration mounts Balanced, polymeric, centrifugal blower wheel for quiet, efficient performance (Models L400KL and L500KL - dynamically-balance metal wheel) Plug-in motor rated at 120 VAC Designed for continuous operation 8 Position mounting brackets for easy installation and greater adaptability to various mounting requirements Automatic backdraft damper located within duct connector Suitable for kitchen installationsAmperage: 1.1 CFM: 375 Collection: LoSone Duct Size: 4-1 2 x 18-1 2 Finish: Galvanized Steel Function: Utility Fan Heater Included: No Housing Depth: 11-3 4 Housing Length: 21-1 2 Housing Width: 12-1 4 Humidity Sensing: No Installation Type: In-Line Light Included: No Motion Sensing: No Sones: 3.1 UL Listed: Yes Voltage: 120 Watts: 146 Weight: 36.30