Lennox 29M74 Limit Switch 328140-751 Standard Threading: Features a 5/16-18

Standard Threading: Features a 5/16-18 NPT female connection for easy replacement and universal fit

using the Carrier SF703026 maintains the factory seal and electrical impedance required for modern high-efficiency systems

This replacement vertical drain pan provides the exact dimensions and port orientations required for optimal moisture management and leak prevention in tight mechanical closets and upright installations

this board manages the induction motor

Lennox 29M74 Limit Switch 328140-751 Standard Threading: Features a 5/16-18The 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