Io Hvac Controls MD-3218-BM Rectangular Zone Damper 32x18 in

Product Description

The IO HVAC CONTROLS MD-3218-BM is a rectangular 2-position zone damper sized at 32 inches wide by 18 inches tall, designed for zoned HVAC duct systems. It ships with a Belimo 3-wire actuator mounted at the bottom of the damper frame, providing reliable open/close control in residential and light commercial forced-air applications. Weighing 19.76 pounds, the unit is built for duct installations where a dedicated actuator per zone is required. The 2-position operation means the damper moves fully open or fully closed based on a low-voltage control signal, making it well-suited for standard zone control board setups.

This damper is installed in rectangular supply or return duct runs as part of a multi-zone forced-air HVAC system. It is typically used in residential new construction or retrofit zoning projects where individual rooms or areas require independent temperature control. The bottom-mount actuator configuration is suited for installations where access from the underside of the duct is preferred. HVAC technicians integrate this damper with a zone control board and thermostat wiring to complete a zoned system.

Key Features

• 32 inches by 18 inches rectangular frame fits standard duct openings of that size
• 2-position operation delivers fully open or fully closed airflow control
• Includes Belimo 3-wire actuator for dependable, proven actuation performance
• Bottom-mount actuator placement accommodates specific duct access requirements
• Compatible with standard low-voltage zone control boards and thermostats

Compatibility

Designed as an OEM-style zone damper for rectangular duct systems requiring 2-position airflow control with a Belimo 3-wire actuator in a bottom-mount configuration.

Installation Notes

Installation should be performed by a licensed HVAC technician. Shut down the air handler and disconnect power to the zone control board before installing or wiring the actuator. The damper must be secured in the duct opening per the manufacturer instructions, and all low-voltage control wiring should be run in accordance with NEC guidelines. Do not energize the actuator before confirming all duct fastening and wiring connections are complete.