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.