The "3CH" designation indicates a Hood #3

preventing issues like under-firing or hazardous incomplete combustion in residential and light commercial units

this Single Pole Single Throw (SPST) switch ensures the combustion environment is vented correctly to prevent hazardous flue gas recirculation

Engineered specifically for HVAC blower flange applications

Durable Construction: Features a robust single-pole design focused on longevity and minimizing arcing across points during high-cycle operation

Lennox 44L72 Limit Switch The "3CH" designation indicates aThe Lennox 44L72 is a high precision 100 145F Auto Limit Switch engineered for critical temperature regulation in commercial and residential furnaces. As a veteran technician knows, the secondary limit must respond instantly to airflow restrictions or over temperature conditions to prevent heat exchanger damage. This Lennox blower limit switch features an automatic reset, opening the circuit when the temperature exceeds 145 degrees Fahrenheit and