Reznor 121275 Block Precise Pressure Calibration: Factory-set at

Precise Pressure Calibration: Factory-set at 0

and elbows without the need for additional fasteners or adhesives

this SPST (Single Pole Single Throw) switch provides the exact calibration required for high-duty cycle environments

the Teflon non-stick material is chemically compatible with standard HFCs and HCFCs

reliable operation throughout the heating season

Reznor 121275 Block Precise Pressure Calibration: Factory-set atThe Reznor 121275 Stack Flue Block is a high limit safety component engineered specifically as an Energy Cutout Device (ECO) for commercial and industrial gas fired heating units. Designed to monitor the integrity of the ventilation system, this blocked vent switch acts as a critical failsafe by measuring exhaust temperatures at the flue. If the sensor detects a restriction, backflow, or overheating condition where temperatures reach the 275F trip