For technicians performing seasonal maintenance

ensuring the burner circuit is interrupted if internal temperatures exceed safe operating parameters

Engineered for high-volume commercial duty

Can I use this tee with R410A systems

Reznor 121275 Block For technicians performing seasonal maintenanceThe 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