Navien Tankless Water Heaters 30014367B Common Vent Collar Kit

The Navien Tankless Water Heaters 30014367B Common Vent Collar Kit is an HVAC venting used in tankless water heater install to enable safe shared exhaust venting between multiple units. It is designed for use with a compatible system, where it manages exhaust flow direction and prevents backflow during cascade or common vent configurations in HVAC systems. The kit includes a vent collar damper and associated connection cables to integrate with the system control setup. Installed on the venting outlet of the heater, it supports proper flue gas management and stable operation in multi-unit and water heating applications.