The FF312H is a "without hold" model

ensuring concentricity and reducing parasitic load on the motor

If installed with a certified vent limiter (such as the 12A09)

effectively maintaining a minimum evaporator pressure to prevent coil icing and optimize humidity levels

Is the ADDA-902-5 the same as the ADDA-902-05

Lochinvar & A.O. Smith 100172022 Gas Valve 320788-704 The FF312H is a "withoutThe Lochinvar & A. O. Smith 100172022 Gas Valve is a critical 24V replacement component specifically engineered for Natural Gas water heaters and boilers, including the EnergyRite series. As a high performance 3 4" x 3 4" gas valve, it maintains precise manifold pressure to ensure stable combustion and optimal thermal efficiency. This genuine OEM water heater part features a robust metal body construction and an internal microprocessor designed for