Zonefirst AOBM-8X18 Damper

The Zonefirst AOBM-8X18 is a professional-grade 8-inch by 18-inch motorized zone damper designed for bottom-mount or top-mount integration in horizontal rectangular ductwork. Engineered with an opposed blade damper configuration, this unit ensures precise airflow modulation by utilizing counter-rotating blades that minimize turbulence and system noise. The damper is driven by a heavy-duty 24Vac power open/power closed actuator, requiring a three-wire SPDT connection to ensure reliable travel in both directions. Built for high-static environments, it sustains a maximum pressure of 0.75" WC. The extruded anodized aluminum frame and blades are complemented by built-in end switches, allowing for seamless interlocking with HVAC equipment or auxiliary relays. This HVAC zoning damper provides a robust solution for multi-zone residential or light commercial air handling systems where consistent air distribution and durability are mission-critical. Installation is straightforward; simply cut a 3-inch slot and secure the integrated 18-inch mounting plate with the included self-tapping screws.

• Opposed Blade Design: Maintains linear airflow and reduces air noise, preventing the "whistling" often associated with single-blade dampers.
• Precision Control: The 24V motorized damper motor moves between full open and closed in approximately 30 seconds for smooth transition.
• Durable Construction: Features stainless steel drawbars and nickel-plated hardware to resist corrosion in high-humidity duct environments.
• Integrated Feedback: Internal end switches provide proof-of-position, enabling the master control board to confirm the damper is fully seated.
• Efficient Integration: Specifically designed for bottom mount zone dampers, fitting the 18-inch side of the duct for maximum accessibility.

How do I wire the Zonefirst AOBM for power open and power closed operation?
The actuator utilizes three terminals: COM (Common), OPN (Open), and CLS (Closed). This 3-wire setup requires a 24Vac signal to the appropriate terminal to drive the motor to the desired position. It does not use a spring-return mechanism.

Can this damper be installed in high-pressure systems?
Yes, the AOBM-8X18 is rated for static pressures up to 0.75" W.C. The rigid aluminum construction prevents blade warping under significant air velocity.

What is the purpose of the built-in end switches?
The end switches are used to signal other system components, such as a furnace or boiler, only after the damper has reached its fully open or closed position, preventing equipment short-cycling.

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.