Unlike universal "will-fit" boards that can lead to flame failure lockouts or unstable 120VAC blower relay signals

This component is typically the sensor only

Rheem-Ruud 70-22436-02 120V Induced Draft Blower W/Gasket

To achieve the lowest specified set point

The 8-13 psi spring range is factory-set for specific sequencing

Armstrong Furnace R40154B025 Limit Switch 322838-753 Unlike universal "will-fit" boards thatThe Armstrong Furnace R40154B025 Limit Switch is a critical safety component engineered specifically for high efficiency HVAC systems. This L130F 30 flame rollout limit switch is designed to monitor internal furnace temperatures, automatically breaking the electrical circuit if the heat exceeds the 130F safety threshold. This genuine Armstrong replacement part ensures your heating system operates within manufacturer specifications, preventing heat