or a major power surge in the line voltage

reducing flame failure calls

you know that using a genuine Lennox OEM part ensures the mounting footprint and wire leads match the original LB-74930 specifications

and hydronic heating retrofits where a 1/2" sweat connection is required

Siemens Building Technology 535-490-18 Temperature Sensor 323269-701 or a major power surgeThe Siemens Building Technology 535 490 18 is a professional grade duct averaging temperature sensor designed for precise climate monitoring in large scale HVAC commercial systems. Utilizing a 100 Ohm Platinum RTD sensing element, this unit effectively mitigates the risks of temperature stratification by averaging the thermal profile across the airflow. The 18 inch rigid probe is constructed for durable deployment within supply or return air ducts,