Product Type Venting For Gas Heaters Compatible with Product Type Wall Furnaces Compatible Mfr Model Number Top Vent Counterflow Furnaces Vent Direction Vertical Vent Length 24 in Vent Diameter 4 in Vent Size 4 in Vent Type Oval Vent Kit Material Aluminum Galvanized Steel Includes (1) 4 in Oval Base Plate (1) 4 in Oval to Round Adapter (1) Set of 4 in Oval Plate Spacers (2) 4 x 24 in Oval Pipe Standards UL Listed