Zonefirst ZDB-10X12 10HX12W Parallel 24V 2-Pos S/R

The 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-close/spring-open operation, providing a critical fail-safe position during power loss to prevent high-limit trips or coil freezing.

Designed for seamless integration with HVAC zone control panels, the ZDB-10X12 utilizes a 2-wire synchronous motor tested for over 250,000 cycles. The aluminum construction is naturally corrosion-resistant, and each blade pivots on self-lubricating Delrin bushings for silent, maintenance-free performance in high-velocity conditions. Contractors can easily field-convert the actuator to power-open/spring-close if the sequence of operations requires it. With a maximum static pressure rating of 1.0” W.C., this rectangular HVAC damper is built for the demanding duty cycles of modern variable-speed and multi-stage equipment.

• Fail-Safe Design: The spring return actuator ensures the damper defaults to the open position during power failures, protecting the compressor and heat exchanger.
• Contractor-Friendly Installation: Bottom-mount configuration allows for easier access in tight overhead spaces, while the motor can be replaced in under a minute via a single setscrew.
• High Cycle Reliability: Features a 24VAC synchronous motor and Delrin bushings designed to withstand years of frequent cycling without binding or squeaking.
• Adjustable Minimum Position: Includes a mechanical stop to allow for bypass air, helping to balance duct pressure without the need for a separate bypass damper in some applications.

Is the ZDB-10X12 compatible with other zone control brands?
Yes, this is a standard 2-wire 24V 2-position damper. It is compatible with most major 24VAC zone control panels, provided they support spring-return actuators.

Can I change it to "Power Open" in the field?
Absolutely. The ZDB series is unique because it can be field-converted from power-closed to power-opened in minutes by relocating the motor's drive linkage and setscrews.

What are the exact dimensions for the duct cutout?
The damper is nominally 10"H x 12"W but is manufactured 1/4" undersized to ensure it slides easily into the ductwork. We recommend a clean 4-inch wide slot for the initial insertion.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.