Check for air leaks behind the plate

Common Questions What are the exact dimensions of the Lennox 44L55

including Miller E2EB series electric furnaces and certain gas-fired units

The 318827 O-ring is specifically engineered to withstand the thermal cycling and chemical treatments found in commercial and residential steam boiler systems

The ACI A/CP-O-EH is a precision 10K Type II thermistor designed specifically for outside air temperature monitoring in commercial building automation systems

Lennox 25J30 Limit Switch Check for air leaks behindThe Lennox 25J30 is a heavy duty, disc style OEM furnace limit switch engineered for high precision thermal monitoring in residential and light commercial air handlers. This SPST normally closed control is a direct drop in replacement for the Lennox 25J3001 and is critical for maintaining safe plenum temperatures. Designed with an automatic reset function, the switch triggers a circuit break when temperatures reach the 155F cutout point, effectively