this valve provides precise thermostatic control and integrated ignition supervision

Integrated dual auxiliary switches provide remote feedback on damper blade position

Simplified Installation: Designed for field-mount applications to streamline damper linkage synchronization

meaning the spring return mechanism will drive the valve to the fully open position if pneumatic pressure is lost

Lennox 29M74 Limit Switch 322838-752 this valve provides precise thermostaticThe Lennox 29M74 Limit Switch is a critical fixed temperature safety component engineered for Lennox furnace flame rollout and primary limit protection. This SPST (Single Pole Single Throw) thermal switch is rated for a 140F trip point with a 30F differential, ensuring precise furnace cycling and preventing heat exchanger damage. Designed as a direct OEM replacement limit switch, the 29M74 features a 1 inch insertion depth and 1 4 inch quick connect