Contractor-Ready Installation: Features 18-inch high-temperature fiberglass insulated leads and standard 1/4-inch terminals for a rapid swap-out

common in most Nordyne-manufactured gas furnaces and electric air handlers

Superior Flame Stability: The engineered orifice and port design prevent lifting or flickering

It is a best practice for contractors to inspect and replace the mounting gasket during installation to ensure a gas-tight seal at the flue outlet

This part is compatible with various KMC series actuators where a 2-inch diameter active area is required for force transmission

Lochinvar & A.O. Smith 100111064 Air Switch L99H008 Contractor-Ready Installation: Features 18-inch high-temperatureThe Lochinvar & A. O. Smith 100111064 Air Switch is a critical safety component designed for precise pressure sensing in high efficiency boilers and water heaters. Engineered with a 6. 0" WC to 5. 0" WC set point, this differential pressure switch ensures the combustion blower is moving sufficient air before allowing the ignition sequence to proceed. As a genuine OEM replacement part, it maintains the precise calibration required to prevent nuisance