Durable Construction: Stainless steel shaft and gate assembly resist oxidation and moisture in the flue stream

15 and UL 757X standards

Ensure the 3/4" MNPT inlet is securely threaded into the boiler's dedicated relief port without restricting the flow path

Misalignment Compensation: Accommodates up to 1 degree of angular misalignment and 0

Hermetic Reliability: Stainless steel power element and laser-welded construction significantly reduce the risk of external leaks

Zonefirst ZDB-12X12 12HX12W Parallel 24V 2-Pos S/R R-410A Durable Construction: Stainless steel shaftThe Zonefirst ZDB 12X12 is a professional grade 12x12 zone damper engineered for robust airflow management in residential and light commercial HVACR systems. Built with a heavy duty extruded aluminum frame and 3 inch parallel blades, this bottom mount zone damper features a 24V spring return motor that ensures fail safe operation by defaulting to the open position during power loss. The low voltage HVAC actuator utilizes a synchronous hysteresis