The "3CH" designation indicates a Hood #3

Rugged 40VA Capacity: Sufficient power overhead to handle modern communicative thermostats and multi-stage relays

Properly sized orifices like the 661042R are essential for maintaining the rated BTU output of the burner assembly

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

75-inch case height ensure compatibility with most existing blower and condenser motor brackets

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