Navien 30014367A Common Vent Collar Kit & Damper NPE NHB NFC
The Navien 30014367A Common Vent Collar Kit & Damper/Backflow Preventer stops exhaust gas backflow (back-draft) at the exhaust vent during operation of the water heater or boiler. By closing the exhaust vent as soon as the combustion cycle ends, the Navien backflow damper retains heat in the system for longer periods. This improves the system's thermal efficiency.
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