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Navien NPE-180A Manual Online: Terminating The Vent. Before installing the water heater, determine what type of vent termination is appropriate for the Do not operate this water heater without proper venting. Navien water heaters come with an upper mounting bracket that is pre-drilled at 16 in on center Navien NPE-180A Manual Online: Venting The Water Heater. WARNING Improper venting of the water heater can result in excessive levels of carbon monoxide, Navien Backflow Damper (Back-draft Damper). 46. Starting the Common Vent System. 47. Connecting and Terminating the Vent Pipe. Navien tankless water heaters & boilers for residential and commercial applications use innovative high efficiency Common Vent Installation Manual. Field supplied pipe and fittings are required to complete the installation. The combustion air and vent pipe fittings must conform to American NationalVenting. Exhaust (o3” & o4”) o3” PVC (or o3” Type BH Special Gas Vent (Class IIA (PVC) in. Canada), o4” Navien Concentric Stainless Steel. Intake (o3”). manual when installing a common vent system for the Navien NPE water heater or NHB/NFB boiler units. DANGER. Category IV appliances require a special Keep this manual near the Navien Combination Water. Heater for future reference Gas Pressure Testing. Measuring Inlet Gas Pressure .. Venting. Common Venting Guide. Condensing Water Heater. When cascading the water heaters with other Navien water heaters, you can install a common venting system.