The Cozy Gravity and Conventional Vent Wall Furnace 4" BW Oval Vent Kit 4OVK is the Oval Vent Kit for all of the Cozy Gravity Wall Furnaces and the Cozy Conventional Vent Counterflow Wall Furnaces. Compatible models include the W225G, W355G, W256G, W356G, W505G, W506G, CF403D, and the CF553D. The BW Oval Vent Kit 4OVK comes with one (1) 4" oval base plate, two (2) 24" sections of oval b/w vent pipes, one (1) 4" oval-round adapter, and two (2) ceiling plate spacers.