Lennox 59W74 Pressure Switch 320788-704 maintaining the integrity of the

maintaining the integrity of the original factory configuration

provided the boiler utilizes a compatible 36-inch ignition lead

for applications requiring a NEMA 4X rating

55" WC rating is standard for specific models

Lennox 59W74 Pressure Switch 320788-704 maintaining the integrity of theThe Lennox 59W74 Pressure Switch is a critical safety component engineered for precision monitoring of inducer motor performance and flue draft integrity. This OEM Lennox furnace pressure switch transitions at a fixed set point of . 80"wc, ensuring the combustion process only initiates when proper negative pressure is established. Featuring a Single Pole Single Throw (SPST) configuration and dual 1 4" barb connections, this switch provides a reliable