Contractor Housing, 4 In Duct Size, BFQ110MBG;BFQ140MBG Fan;BFQ50T;BFQ75T;BFQ90MBG;Grill and Motor For Use With, Lock In Bracket Includes, Polymeric Material, 4 In Opening Diameter, 8-1/2 In Overall Depth, 3-7/8 In Overall Height, 9-1/8 In Overall Width, 4 PK Package Quantity