The 1/4" sweat connections on this unit are designed to slide over 1/4" tubing for a standard brazed joint

Engineered for compatibility with specific Goodman and Amana gas furnaces

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

The "3CH" designation indicates a Hood #3

Ensuring your system operates above this threshold is critical to prevent valve chatter

Lennox 44L72 Limit Switch The 1/4" sweat connections onThe 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