this unit offers a seamless mechanical crossover

The physical dial on the board allows you to adjust the ventilation schedule between 1 and 60 minutes per hour to meet the required airflow rate measured at the intake duct

but physical specifications and performance remain the same

Fail-Safe Operation: Integrated spring return mechanism ensures the valve returns to a normally closed position during power loss

feature internal threads on the valve body rather than external

Lochinvar & A.O. Smith 100093859 Assembly R-410A this unit offers a seamlessThe Lochinvar & A. O. Smith 100093859 Manifold Door Assembly is a high precision OEM replacement engineered for high efficiency gas fired boilers and residential FVIR water heaters. As a veteran grade burner door assembly, this kit is essential for maintaining the sealed combustion chamber's integrity, ensuring optimal thermal efficiency and safe manifold pressure regulation. The assembly integrates a robust door port designed to withstand high