Io Hvac Controls MD-3020-BM Rectangular Zone Damper

Product Description

The IO HVAC CONTROLS MD-3020-BM is a rectangular two-position zone damper designed for duct zoning applications in forced-air HVAC systems. Measuring 30 inches by 20 inches, it ships with a bottom-mount configuration and a Belimo 3-wire actuator for reliable open/close control. The damper regulates airflow to individual zones, allowing the system to deliver conditioned air only where it is needed. At 15.76 pounds, this is a substantial unit suited for commercial or larger residential duct systems. Licensed HVAC technicians and sheet metal contractors are the primary installers for this type of equipment.

This damper is used in zoned forced-air systems where multiple thermostats or a zone controller directs airflow to separate areas of a building. The bottom-mount actuator placement suits installations where duct access is from below the unit. The Belimo 3-wire actuator operates as a standard spring-return or non-spring-return device depending on the control wiring configuration, and it integrates with most residential and light-commercial zone control boards that output a standard low-voltage signal. Typical applications include multi-zone residential builds, light commercial office spaces, and retrofit zoning projects.

Key Features

• 30 x 20 inch rectangular duct opening for high-volume airflow control
• Two-position operation for straightforward open/close zone control
• Bottom-mount actuator design for accessible installation in tight duct runs
• Includes Belimo 3-wire actuator for compatibility with standard zone control systems
• Robust construction at 15.76 pounds for long-term commercial and residential service

Compatibility

Designed as an OEM-style zone damper for use with low-voltage zone control systems that support a standard 3-wire actuator signal. Consult the zone control board manufacturer specifications to confirm actuator wiring compatibility before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor familiar with duct zoning systems and low-voltage control wiring. Shut down the air handler and de-energize the zone control panel before installing or wiring the damper. Secure the damper firmly into the duct opening and verify the actuator arm moves freely through its full travel before restoring power. Follow all applicable local mechanical codes and manufacturer wiring diagrams when connecting the 3-wire actuator to the zone controller.