Lennox 18M63 Pressure Switch 321042-401 this assembly features a normally

this assembly features a normally open (NO) configuration with a 4

and vapors through photocatalytic oxidation

or dual fuel HVAC systems

Its universal mounting capability ensures that technicians can quickly swap out failed components in furnaces

316155A is identical to 316155A/U

Lennox 18M63 Pressure Switch 321042-401 this assembly features a normallyThe Lennox 18M63 Pressure Switch is a high precision, two stage OEM furnace part specifically engineered for compatible Lennox, Armstrong, and Ducane heating systems. This dual action component provides critical monitoring of combustion air pressure, ensuring the inducer fan maintains the proper venting required for safe ignition and continuous high efficiency operation. With fixed set points of 0. 20" WC and 0. 45" WC, this switch accurately