Exhaust Fan, Room-to-Room, Duct Dia 8 In, CFM @ 0100-In SP 180, Sones HVI 4.5, Voltage 120, 60 Hz, 1.5 Amps, Housing Length Adj 3 to 5 1/2 In, Housing Width 11 1/2 In, Housing Height 11 1/2 In, Grille Length 13 1/2 In, Grille Width 13 1/2 In, Includes Adjustable Speed Switch With Positive Off