Lennox 51W93 -1.12" WC SPST Pressure Switch

The Lennox 51W93 -1.12 Inch WC SPST Pressure Switch is a valuable hardware within the HVAC systems to control the air pressure within the furnace or any heating equipment. This kind of SPST pressure switch measures the air pressure in the system and turns on or off the electrical circuit at a specific pressure of -1.12 Inches water column. When the pressure goes high than the permitted level, the switch turns on, hence regulating the operation of the furnace and circulating the air as required.