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Designer’s Guide / Knight XL BoilerAnother example, some local codes do not allow the use of PVC or CPVC for venting flueproducts. In some areas, local code demands the use of Stainless Steel vent material.LOCHINVAR CORPORATION300 MADDOX SIMPSON PKWYLEBANON, TN 37090www.lochinvar.comAIR INTAKE MATERIALWith air intake material, you have a wider choice. PVC, CPVC and ABS are allowed. Steel pipe,galvanized or stainless with all joints and seams sealed gas tight. Type “B” double wall ventmaterial with all joints and seams sealed gas tight. With horizontal applications only, you mayeven use Dryer Vent or Sealed Flex Duct.Again, you can choose whatever but we remind you of several points. ABS is acceptable for theair intake pipe but not for venting. ABS has been used in the past for venting. In some areas,local codes have been passed that disallow the use of ABS for venting.Notice the regular reference to sealing the joints and seams. Whatever air intake material isused, the piping MUST be sealed air tight or gas tight. This is also a requirement of the ventpiping. But that is logical. It’s a positive pressure stack carrying flue products so it must besealed from leaks. People often wonder why we ask to seal the air intake pipe. It’s to keep abalance of pressure between the air pipe and the vent pipe. A balance that helps the Knight XLbreathe easier.The use of double wall “B” Vent or insulated material for the combustion air intake pipe isrecommended in cold climates to prevent the condensation of moisture.VENT LENGTHSThe minimum length for the combustion air intake piping is 12 equivalent feet. The minimumlength for the exhaust is 12 equivalent feet.The maximum length for the combustion air intake piping is 100 equivalent feet. The maximumlength for the exhaust is 100 equivalent feet.When determining equivalent length, add 5 feet for each 90° elbow and 3 feet for each 45° elbow.ImportantTHE APPLIANCE OUTPUT RATE WILL REDUCE BY UP TO 1.5% AT THE MAXIMUM VENT LENGTH.VENT & AIR INTAKE DIAMETERSKnight XL 400 – 501 – 601 / 4” vent and 4” air intake pipe.Knight XL 701 – 801 / 6” vent and 4” air intake pipe.The total lengths of each pipe must be these listed diameters. Increasing or decreasing the ventor combustion air piping is not authorized.Part 2Vent / Air Intake ConfigurationsIn the following pages, we will look at each vent / air configuration. For more details andinstallation requirements, please review the Knight XL Installation and Operation manual.3
Designer’s Guide / Knight XL BoilerDIRECT VENT / SIDEWALL - CATEGORY IV VENTINGPVC / CPVC WITH VENT/AIR TERMINATION PLATE.LOCHINVAR CORPORATION300 MADDOX SIMPSON PKWYLEBANON, TN 37090www.lochinvar.comThe exhaust piping terminates out the sidewall. The combustion air pipingterminates out the sidewall.BULLET POINTS This is Category IV venting, positive pressure,condensing stack. All joints and seams must be sealed gastightand may not be common vented. The vent termination plates are provided byLochinvar as standard equipment and all other ventmaterial for this configuration will be obtained locally. Maximum distance – 100 equivalent feet of vent. Maximum distance – 100 equivalent feet of air intake.4
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Lochinvar - API of NH

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