An in depth study of propane and natural gas piping from the point of delivery to the gas appliance or utilization equipment. Basic gas theory involving a thorough understanding of the physical properties and characteristics of propane and natural gas will be covered. Piping installations involving gas pipe sizing, material selection, proper installation, and pressure and leak testing of piping is also covered. National Fuel Gas Code as it relates to the above topics is also emphasized. Students must be simultaneously enrolled in HVAC135M. It is recommended that students have successfully completed or are simultaneously enrolled in HVAC101M, HVAC109M and HVAC110M.