Fan/light/heater unit has quiet aluminum squirrel cage blower wheel and 2-motor system with individual controls for fan, heater, and light. White plastic 10-1/4″ x 15-1/2″ grille, Lexan light lens. 8-1/4″ x 14-1/4″ x 5-3/4″ housing, fits joists as small as 6″. 4 adjustable mounting brackets have 24″ span. Uses up to one 100W bulb (not included). Control with P66 series switch (not included). 70 CFM, UL listed. No. 655: Type: Fan/Light/Heater, Rate: 70 cfm, Sound Rating: 4.0 sones, Voltage: 120V, For Use With: 4″ Round Duct, Grille Length: 15-1/2″, Grille Width: 10-1/4″, Globe: Frosted, Color/Finish: White, Bulb Size: 100W, Bulb Included: No, Energy Star Rated: No, Title 24 Compliant: No, UL Listed: Yes, Pkg Qty: 1, Package Type: Box