Io Hvac Controls MBD-12 Manual Balancing Damper 12 Inch Round

Product Description

The IO HVAC CONTROLS MBD-12 is a manual balancing damper designed for round ductwork with a 12-inch diameter. It provides precise, field-adjustable airflow control within forced-air HVAC systems. The damper features a locking quadrant that holds the blade at the set position, preventing drift after commissioning. At 7.45 pounds, it is a solid, installation-ready component suited for use in both new construction and retrofit applications. Licensed HVAC technicians and sheet metal contractors typically install this damper during system balancing to meet design airflow targets across individual supply or return branches.

The MBD-12 is intended for use in residential and light commercial forced-air distribution systems where manual zone or branch balancing is required. It fits into 12-inch round duct runs and is well-suited for installation in accessible locations such as plenums, mechanical rooms, and exposed duct sections where the quadrant can be adjusted and locked after final air balancing. No powered actuator or control wiring is required, making it a straightforward solution for reducing airflow to over-supplied zones.

Key Features

• 12-inch round duct connection for direct in-line installation
• Locking quadrant holds blade position after balancing is complete
• Manual operation requires no actuator, wiring, or control signal
• Robust construction at 7.45 pounds for stable in-duct mounting
• Suitable for supply or return branch balancing applications

Compatibility

Designed as an OEM-style manual balancing damper for 12-inch round ductwork in residential and light commercial forced-air HVAC systems.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor. Shut down the air handling unit and confirm the system is de-energized before cutting into ductwork or securing the damper in place. The damper should be installed in a location that remains accessible for future airflow adjustments. Secure the locking quadrant firmly after final air balancing to prevent unintended blade movement.