Durable diaphragm construction engineered to withstand high-cycle residential and commercial heating demands

Installation Ready: Standard 3/4-inch NPT connections (Male x Female) allow for straightforward replacement in existing pipe networks

leading to rapid degradation and element failure during operation

Precision Voltage: Optimized for an open circuit mV range of 20 to 28 mV to minimize voltage drop issues across the lead

and 36G series valves

Lennox 15M20 Pressure Switch Els PW 17895 Durable diaphragm construction engineered toThe Lennox 15M20 Pressure Switch is a critical safety component designed for precise draft proving in residential and commercial furnaces and rooftop units. This OEM Lennox 15M20 switch is a single pole, single throw (SPST) normally open configuration that closes when it detects a pressure fall of . 10"wc. Built with a 1 4" barb connection for easy hose attachment, this air proving switch ensures the combustion air inducer is pulling sufficient vacuum