Features: Fully enclosed condenser motor with powerful 110 CFM Sirocco blower that operates at a whisper-quiet .6 Sones. Heavy-gauge galvanized steel and zinc fan housing is insulated to prevent condensation, and promotes durability through rust proof paint treatment applied to the exterior that impedes oxidation. Steel-sheathed, 1400 Watt heating element with Nichrome wiring provides optimal warmth when temperatures start to drop. WhisperWarm™ fans do more than just ventilate stale air. They are also equipped with two 18-Watt Compact Fluorescent Lights to illuminate your surroundings, and a 4-watt nightlight to aid in finding your way through the dark. Internal configuration of components allows the condenser motor to operate at cooler temperatures, preventing degradation and increasing the lifespan of the motor and bearings. Built-in backdraft damper prevents chilly, outside air from entering.Technologies: WhisperWarm™ Design: This unit is equipped with a 1400 Watt heating element to ensure warmth during chilly days, while ventilating and refreshing clean, healthy air.Specifications: CFM: 110 Sones: .7 Duct Diameter: 4" Grille Width: 13-5/16" Grille Length: 18-1/8" Housing Width: 12-5/8" Housing Length: 17-3/8" Lighting: Two (2) 18-Watt CFL, One (1) 4-Watt Night Light EnergyStar® Qualified: No Blower Wheel Type: Sirocco UL Listed: No HVI Certified: Yes Weight: 22.7 lbs.