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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
Precise Pressure Calibration: Factory-set at 0
secondary output to ensure stable operation of thermostats
Direct Compatibility: Engineered as the official successor to multiple legacy parts
this SPST (Single Pole Single Throw) switch provides the exact calibration required for high-duty cycle environments
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