Features: Fully enclosed condenser motor with powerful 80 CFM Sirocco blower that operates at a whisper-quiet .3 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. Adjustable mounting brackets (up to 26 inches), detachable 4" or 6" adaptors, and a double-hanger bar system are all included to make the installation process user-friendly and trouble-free. Built-in backdraft damper prevents chilly, outside air from entering. Internal configuration of components allows the condenser motor to operate at cooler temperatures, preventing degradation and increasing the lifespan of the motor and bearings. UL Listing permits use in tub and shower enclosures when used with a GFCI branch circuit wire. WhisperLite™ fans do more than just ventilate stale air. They are also equipped with two 13-Watt self ballasted Compact Fluorescent Lights to illuminate your surroundings, and a 4-watt nightlight to aid in finding your way through the dark.Technologies: EnergyStar® Qualified: High CFM-to-Watt efficiency is the primary goal of Panasonic WhisperLite™ fans. The facets of EnergyStar® program are twofold: saving you money, while protecting the environment by conserving energy at the same time. Specifications: CFM: 80 Sones: .3 Duct Diameter: Adaptor for 4" or 6" Grille Width: 13" Grille Length: 13" Housing Width: 10-1/2" Housing Length: 10-1/2" Housing Depth: 7-2/5" Lighting: Two (2) 13-Watt CFL, One (1) 4-Watt Night Light EnergyStar® Qualified: Yes Blower Wheel Type: Sirocco UL Listed: Yes (for Tub/Shower Enclosure with use of GFCI branch circuit wire) HVI Certified: Yes Weight: 12.6 lbs.