Io Hvac Controls MD-2818 Rectangular Zone Damper 28x18 in

Product Description

The IO HVAC CONTROLS MD-2818 is a rectangular 2-position zone damper sized at 28 inches wide by 18 inches tall, designed for use in zoned HVAC duct systems. It ships with a Belimo 3-wire actuator, providing reliable open/close control for residential and light commercial zoning applications. The damper regulates airflow to individual zones, allowing an air handler or furnace to distribute conditioned air only where a thermostat calls for it. Licensed HVAC technicians typically install this unit during new system commissioning or zone system upgrades. At 16 pounds, the MD-2818 is a substantial assembly suited for larger trunk or branch duct runs.

This damper is intended for rectangular duct installations where a 28-inch by 18-inch opening is present. It fits into zoning systems that rely on 2-position (fully open or fully closed) control logic, common in residential multi-zone forced-air setups and light commercial variable-air-volume applications. The included Belimo 3-wire actuator is wired directly to a compatible zone control board or panel, enabling straightforward integration into standard low-voltage zoning systems. The overall assembled dimensions are 21 inches wide, 34 inches tall, and 8 inches deep, which should be confirmed against available installation clearance before ordering.

Key Features

• 28 inches by 18 inches rectangular damper blade sizing fits large duct openings
• 2-position operation provides fully open or fully closed airflow control
• Includes Belimo 3-wire actuator for low-voltage zone control integration
• Assembled package dimensions: 21 inches wide, 34 inches tall, 8 inches deep
• Substantial 16-pound construction suited for commercial-grade duct installations

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for rectangular duct systems requiring a 28-inch by 18-inch 2-position damper with a Belimo 3-wire actuator.

Installation Notes

Installation should be performed by a licensed HVAC technician following applicable mechanical codes. Power down the air handler and zone control panel before wiring the actuator. Confirm duct opening dimensions and available clearance match the assembled package size of 21 by 34 by 8 inches before mounting. Low-voltage actuator wiring must be connected to a compatible zone control board per the actuator wiring diagram.