this hot surface ignitor (HSI) is a direct drop-in for units requiring precise timing and voltage compatibility

the sensor must be positioned in the direct path of the airflow as specified by the furnace design to accurately monitor the plenum temperature and respond immediately to potential overheat conditions

This product is a complete blank handle faucet assembly

this sensor provides superior longevity compared to auxiliary contact relays

this unit is an OEM replacement HVAC thermostat engineered to maintain indoor comfort through efficient staging of heating and cooling cycles

Lennox 34M74 Pressure Switch Els PW 17895 this hot surface ignitor (HSI)The Lennox 34M74 Pressure Switch is a critical safety component engineered for precision monitoring of combustion air in residential and commercial HVAC systems. This OEM Lennox replacement part features a single pole, single throw (SPST) electrical configuration, meticulously calibrated to an actuation point of . 33" WC (inches water column). Designed with a standard 1 4" barb connection, it ensures a secure, leak proof interface with the inducer