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Carrier LH33WZ005 Flame Sensor Assembly Els PW 17895 The Lennox 18K69 Limit Switch The Lennox 18K69 Limit Switch is a critical safety component designed for precise thermal management in Lennox electric furnaces and air handlers this differential air switch is a standard drop in replacement for failed pressure sensors in specialized combustion or ventilation systems where precise set points are required for system interlock circuits
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