Gas Fired Boiler17Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.53513.5 Inlet Air and Exhaust Venting3.5.1 Applicable Codes and StandardsCodesUnited States:NFPA 54/ANSI Z223.1 National Fuel Gas CodeNFPA/ANSI 211 Chimneys, Fireplaces, Vents and SolidFuel Burning AppliancesCanada:CAN/CSA B149.1 Installation Codes for Gas BurningEquipmentStandardsUL 1738 Venting Systems for Gas-BurningAppliances, Categories II, III and IVULC S636-95 Standard for Type BH Venting SystemSheet Metal and Thermoplastic DuctConstruction Manual Air ConditioningContractors National Association(SMACNA)These codes and standards contain information for the venting ofgas fired appliances, including, but not limited to vent sizing,location, clearance to combustibles, and safe installation practices.The installation must comply with both the above Federal Codesand with state, provincial and local codes.Table 3.5.1Required Stainless Steel Vent Adapters and Category II MotorizedDampersBoiler Size Nom.ventSizeStainlessVentAdapterVentadaptersizeBoilerCombustionAir inletCombustion airN.C. MotorizedDamperSizeSC-2000 10” 2640000133 10” 12” 1004906946 12”SC-3000 10” 2640000133 10” 12” 1004906946 12”SC-4000 10” 2640000133 10” 12” 1004906989 14”NOTE: This table is for information only. Combustion air dampersand vent adapters are listed for use of design and may or may notbe specific to your application.Design and installation of ventingsystems should be done only bequalified and knowledgeableventing systems personnel and inaccordance with vent systemmanufacturer’s installationinstructions. Installing a boiler orvent system using improperinstallation methods or materialscan result in serious injury or deathdue to fire or asphyxiation.Before connecting a boiler to aventing system, it must bedetermined whether the boiler is tobe installed in a conventional ordirect vent configuration. In theUS, provisions for combustion airmust be in accordance with NFPA54/ANSI Z223.1, National FuelGas Code, latest edition, orapplicable provisions of the localbuilding codes. In Canada,combustion and ventilation airopenings shall comply withCAN/CSA B-149.1 Natural Gasand Propane Installation Code.For correct installation of ventsystem, read all of theseinstructions and refer to ventmanufacturer’s instructions.Failure to use a proper vent system(types and materials), as describedin this manual will void the boilerwarranty and may result in rapiddeterioration of the venting system,creating a health or life safetyhazard.Faulty vent installation can allowtoxic fumes to be released intoliving areas. This may causeproperty damage, injury or death.