Lochinvar & A.O. Smith 100188878 Fan Assembly 322056-301 This is the manufacturer-recommended direct

This is the manufacturer-recommended direct replacement

Once the unit cools to 130°F (Closed)

This HVAC blower wheel replacement measures 11 inches in diameter with a 10-inch width and utilizes a 1/2-inch bore diameter with a secure set-screw attachment

Optimized Combustion: The integrated #30 orifice provides the correct BTU input for natural gas configurations to maximize system efficiency

This snap-action HVAC furnace limit switch features a compact footprint and standard mounting orientation

Lochinvar & A.O. Smith 100188878 Fan Assembly 322056-301 This is the manufacturer-recommended directThe Lochinvar & A. O. Smith 100188878 Fan Assembly is a critical OEM replacement component engineered specifically for the FTX500 series high efficiency boilers. Designed to maintain precise combustion air ratios, this heavy duty blower ensures optimal airflow for FTX500L and FTX500N models. As a veteran technician knows, maintaining the correct static pressure within the combustion chamber is vital for system longevity and peak thermal efficiency.