Io Hvac Controls MD-05 Round Zone Damper 5 Inches

Product Description

The IO HVAC CONTROLS MD-05 is a 5-inch round, two-position zone damper designed for use in residential and light commercial forced-air HVAC zoning systems. It ships with a Belimo three-wire actuator, giving installers a fully assembled, field-ready unit without sourcing a separate actuator. The damper opens and closes on a direct 24-volt signal, making it compatible with standard zone control boards and thermostats. Licensed HVAC technicians install this type of damper to divide a duct system into independently controlled zones, improving comfort and system efficiency. The compact actuator profile fits inside standard duct chases without requiring additional clearance modifications.

The MD-05 is suited for round ductwork in residential zoning applications as well as light commercial retrofit and new-construction projects. It is typically installed in trunk-and-branch or radial duct layouts where individual rooms or zones require independent temperature control. The two-position operation keeps the control sequence straightforward, with the damper driving fully open or fully closed based on a call from the zone controller. HVAC technicians working with multi-zone air handlers or furnaces will find the Belimo actuator pairing familiar and reliable in these standard configurations.

Key Features

• 5-inch round duct size fits common residential and light commercial branch runs
• Two-position operation for simple open/closed zone control logic
• Includes factory-mounted Belimo three-wire actuator for field-ready installation
• Compatible with standard 24-volt zone control boards and thermostats
• Assembled unit reduces parts sourcing and installation time on the job

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for residential and light commercial forced-air zoning systems using 5-inch round ductwork and 24-volt control wiring.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with low-voltage control wiring and duct system modifications. Shut down the air handler or furnace and disconnect power at the disconnect or breaker before cutting into ductwork or connecting control wiring. The three-wire Belimo actuator requires a dedicated zone controller output; verify the control board's VA rating supports the actuator load before wiring. Follow local mechanical codes and manufacturer wiring diagrams when integrating the damper into the zone control system.