Goodman 40K BTU 96% AFUE Downflow / Horizontal Gas Furnace, GCVC960403BN, S&D
With all gas furnaces at 90% efficiency and above like this one, the flue venting must be plastic or PVC. The GCVC960403BN furnace runs on natural gas from the factory. When you field-install the optional LP conversion kit, this furnace can use propane instead when the installation requires it.