Resideo MARD-10 Damper

As a direct replacement for the legacy Honeywell URD-10, the Resideo MARD-10 is a heavy-duty 10-inch round modulating damper designed for rigorous performance in HVAC zoning systems and bypass applications. Built from 22-gauge galvanized steel, this single-blade unit handles static pressures up to 2.0 in. W.C., making it ideal for large residential systems and light commercial installs over 5 tons. The integrated 24V floating actuator provides precision power open/power closed control via a three-wire terminal, ensuring an airtight seal and reliable air distribution. Unlike standard spring-return models, the MARD-10 features a 90-second motor timing that allows for granular air modulation when paired with a Static Pressure Control (SPC) or as a dedicated zone control damper. Technicians will find the male/female crimped ends streamline integration into rigid or flexible round ductwork, maintaining system efficiency without the turbulence typical of lower-grade dampers.

• Direct Retrofit Compatibility: Engineered as the professional-grade upgrade for the Honeywell URD-10, ensuring seamless mechanical and electrical replacement.
• Modulating Precision: The 3-wire floating actuator allows for exact blade positioning, critical for automated bypass control in high-CFM systems.
• Industrial Durability: The 22-gauge steel construction prevents blade warping and ensures a long service life in high-velocity hvac ductwork.
• Flexible Installation: Can be mounted in any orientation (except with the motor on the bottom) to accommodate tight mechanical room footprints.

Common Questions

Can I use the MARD-10 with a standard 2-wire zone panel?
No, this is a three-wire, 24Vac power open/power closed device. It requires a floating-control signal or a compatible 3-wire zone panel to manage the actuator correctly.

Is the motor replaceable without removing the entire damper from the duct?
Yes, the LMB24-3-T actuator (or the older ML6161) can be swapped out by loosening the U-bolt, allowing for efficient field service without breaking the duct seal.

What is the maximum CFM rating for the 10-inch model?
The MARD-10 is typically rated for approximately 750 CFM in bypass applications at .25 in. friction loss, providing optimal pressure relief for modern inverter-driven systems.

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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.