It carries UL864 and UL916 listings

Precision Drainage: Features a pitched design to eliminate standing water

it is engineered for seamless integration into existing liquid lines

Always verify the specific thermostat and defrost board configuration of the equipment

and circulator pumps

Zonefirst ZDB-10X12 10HX12W Parallel 24V 2-Pos S/R Refrigerant It carries UL864 and UL916The Zonefirst ZDB 10X12 is a professional grade parallel blade zone damper engineered for precise airflow management in residential and commercial 24V zoning systems. This 10HX12W bottom mount damper features a heavy duty extruded aluminum frame and 3 inch parallel blades, ensuring minimal static pressure drop while maintaining a rigid structure across the duct opening. Driven by a 24V spring return motor, the unit is factory configured for power