Selkirk 184048 Round Gas Vent Pipe 4 in. x 4 ft. - pack of 2
max, 500 deg. FeaturesSize: 4" x 4'Type "B" gas ventOD = ID + 1/2"Installed length 1-1/2" less than listed lengthAluminum inner wall, galvanized outer wallFor gravity draft venting of LP or Natural Gas appliances100 million BTU/hr. Not for wall furnacesSpecificationsDimension: 4..