5.0501 Combustion Appliance Zones 5.0501.1 Isolate CAZ 5.0502 Combustion Air 5.0502.1 Combustion Air - Fuel-Fired Appliances 5.0503 Appliance Venting 5.0503.1 Fuel-Fired Appliance Venting 5.0504 Fuel Delivery 5.0504.1 Natural Gas/Propane Fuel Piping 5.0504.2 Oil Piping
