Features High efficiency impeller. UV resistant housing. Housing is epoxy sealed for durability and performance. Kit Includes a 4 in. Input/output Fan, Mounting Hardware and Two White 4 in. to 3 in. Rubber Couplers. Kit does not include the air pressure indictor. ETL Listed for Indoor/outdoor Use. Conforms to CSA C22.2 no. 113. Conforms to UL 705. Dimension - 10.5 x 10.5 x 16.25 in.