Lennox 76M31 Sensor 321702-401 375 orifice diameter is precision-machined

375 orifice diameter is precision-machined to facilitate the correct exhaust velocity

this module interprets 24VAC signals from the furnace control board to modulate airflow based on real-time heating or cooling demands

Thermal overload relays focus on overcurrent and phase loss

The 12-200 series is specifically designed for steam and should not be used in water or liquid service applications

Lennox 76M31 Sensor 321702-401 375 orifice diameter is precision-machinedThe Lennox 76M31 is a high precision return air duct relative humidity sensor engineered for demanding commercial and industrial HVACR applications. As a non communicating duct mount RH sensor, it provides critical real time moisture data to the Lennox Prodigy and CORE unit controllers, essential for managing Humiditrol reheat systems and supermarket humidity control. Designed for technical reliability, this 24VAC HVAC humidity sensor features a