The Rinnai 104000195 Water Heater Fan Assembly Kit supports proper airflow through compatible tankless water heaters during operation. The fan moves air through the combustion system, supplying the airflow required for efficient burner operation and directing exhaust gases through the designated venting pathway. Its function supports stable combustion, consistent heating performance, ... https://www.hnkparts.com/104000195-rennai-kit-fan-assembly-rc98hpie/4-104000195.html