Reznor 121275 Block reliable operation throughout the heating

reliable operation throughout the heating season

High-Temperature Durability: Includes TFE with Hypalon seals suitable for saturated steam and high-heat applications up to 450°F

Precise Pressure Calibration: Factory-set at 0

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

secondary output to ensure stable operation of thermostats

Reznor 121275 Block reliable operation throughout the heatingThe 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