The NAVIEN 30008834A Fan with Motor FB-1K050 is a replacement fan assembly designed to support proper combustion airflow in compatible Navien NCB and NCB-E series condensing boilers. The motor drives the fan to supply a controlled volume of air to the combustion system, helping maintain the correct air-to-fuel ratio for efficient operation. This component is commonly used in residenti... https://www.partshnc.com/30008834a-navien-tankless-water-heaters-fan-wmotor-fb-1k050-ncbncb-e