You will need standard wrenches or a socket set to remove the spring cage and access the internal seat/stem module

vertical-shaft operation

avoiding the direct path of discharge air

This represents the set points (in inches of water column) at which the switch makes or breaks the electrical circuit to confirm safe inducer fan operation

For most Lennox air handler applications using the 10kW heat section

Daikin-McQuay 4009629 Circuit Board 323613-751 You will need standard wrenchesThe Daikin McQuay 4009629 Circuit Board is a critical OEM replacement component engineered for high precision HVAC control systems and automation. Designed as a central processing hub for specific energy efficient units, this printed circuit board (PCB) manages essential logic for sensors, blower motors, and thermostats to ensure peak system performance. Its advanced circuitry is optimized for thermal management and reduced electromagnetic