you can slip the mounting frame over the existing thermostat and secure it directly to the wall

The Lennox 44L72 is a high-precision 100-145F Auto Limit Switch engineered for critical temperature regulation in commercial and residential furnaces

all of which reduce airflow and cause internal temperatures to exceed the 190

While universal models exist

For suction line cleanup after a burnout

Sensus 143-82-021-00 Spring you can slip the mountingEnsure reliable pressure regulation in commercial gas services with the Sensus 143 82 021 00 Red and Black Spring. Specifically engineered for the Sensus 243 8 service regulator, this main adjustment spring provides a precise outlet pressure range of 3. 5" to 6. 5" w. c. (water column). As a critical component in Sensus 243 8 2 and 243 12 series valve bodies, this OEM regulator spring allows technicians to dial in set points for boilers, industrial