Dwyer Instruments AAFS Switch 30067439-890 this direct OEM replacement ensures

this direct OEM replacement ensures your furnace or boiler maintains a consistent 3

Safety Compliance: Provides critical flame rectification and monitoring to prevent dangerous "no-flame" gas flow scenarios

enabling comprehensive monitoring of pressure

the inclusion of T4002 mounting hardware

Relying on genuine York replacement parts ensures that the system’s CFM delivery remains within factory specifications for heating and cooling cycles

Dwyer Instruments AAFS Switch 30067439-890 this direct OEM replacement ensuresThe Dwyer Instruments AAFS Adjustable Air Flow Paddle Switch is a heavy duty sensing solution engineered to monitor and verify air flow velocity in HVAC and industrial ductwork. Designed to handle air and compatible gases, this unit features a field adjustable SPDT switch, allowing for precise setpoint selection between 200 to 1800 FPM. As the direct replacement for F40AA 2, it offers a drop in upgrade for legacy systems requiring reliable proof of