Lennox 71G17 Vent Switch which are typically found on

which are typically found on the suction side of larger scroll compressors

The MARS 12751 fits most round-style mounting brackets with its standard 2-inch diameter

This target wall is designed for the Dunkirk Empire II Series II and equivalent Utica-Dunkirk cast iron boilers

This clear plastic thermostat cover provides a robust physical barrier against unauthorized adjustments

OEM Compatibility: Precision-engineered for a drop-in fit in York

Lennox 71G17 Vent Switch which are typically found onThe Lennox 71G17 Vent Switch is a critical safety component designed for precise thermal monitoring in high efficiency HVAC systems. Engineered as a 300F manual reset limit switch, this device serves as a primary defense against dangerous flue obstructions or heat exchanger failures. When vent temperatures reach the 300 degree Fahrenheit threshold, the internal circuit opens, instantly terminating the gas valve signal to prevent carbon monoxide