As a 1-phase step-down transformer with no internal over-current protection

the "B" suffix typically indicates a packaging or bulk revision

always verify the gas orifice and venturi settings during installation

It opens proportionally as pressure increases beyond the 125 PSI set point

Common Questions Regarding 4J-1 Flanges What is the maximum torque capacity of the Size 4 J Flange

Lochinvar & A.O. Smith 100109957 Blower Assembly 323055-751 As a 1-phase step-down transformerThe Lochinvar & A. O. Smith 100109957 Blower Assembly is a factory authorized OEM component engineered for high recovery FPSH 75 water heater models. As a critical part of the combustion system, this forced draft blower ensures precise air to fuel ratios and consistent venting of flue gases. This assembly is the direct successor to multiple discontinued part numbers, including 9004581105, 194509 00, and 195841 000, allowing for seamless integration