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.