the underlying airflow or venting issue must be corrected

and 8324 models

This pneumatic control accessory is essential for clean-room or secure-facility applications where a "blind" cover is required to ensure consistent system calibration and energy efficiency

Can the ST-3 sampling tube be used in ducts narrower than 2 feet

MARS 39220 Limit Switch the underlying airflow or ventingThe MARS 39220 Limit Switch is a versatile, high reliability solution for field service technicians needing an exact or universal replacement for furnace high limit applications. This adjustable snap disc thermostat features a temperature range of 135F to 175F with a fixed 40F differential, allowing for precise calibration to match specific internal plenum requirements. Designed as an open on rise safety device, the 39220 ensures the heating circuit