Kit contains everything you need to vent both 3'' and 4'' exhaust fans. Features a low profile exhaust hood with removable collar. The hood has a molded water barrier ring that prevents water from entering. The hood is constructed of high impact copolymer resin that resists UV rays and extreme temperatures. Kit includes black exhaust hood, 4'' x 8' vinyl ducting, 2 clamps, and a 3'' to 4'' foam adapter ring. Fan not included.