Io Hvac Controls MD-3216-BM Zone Damper 32x16 Bottom Mount

Product Description

The IO HVAC CONTROLS MD-3216-BM is a rectangular two-position zone damper designed for ducted HVAC zoning systems. It ships with a Belimo three-wire actuator mounted on the bottom of the damper body, providing reliable open/close control in forced-air distribution applications. The damper measures 32 inches in duct width by 16 inches in duct height, making it suitable for larger trunk or branch duct runs. At 8 pounds, it is a substantial assembly intended for permanent installation. Licensed HVAC technicians and sheet metal contractors are the primary installers for this type of equipment.

This zone damper is used in residential and light commercial zoning systems where individual areas or rooms require independent airflow control. It is suited for rectangular duct installations where a two-position, fully open or fully closed control strategy is applied. The bottom-mount actuator orientation is useful in installations where top or side access is restricted by overhead obstructions or adjacent ductwork. The Belimo three-wire actuator provides spring-return functionality, ensuring a fail-safe position on power loss.

Key Features

• Rectangular damper sized at 32 x 16 inches for larger duct applications
• Two-position operation: fully open or fully closed airflow control
• Includes Belimo three-wire actuator for reliable, spring-return actuation
• Bottom-mount actuator configuration for restricted-access installations
• Assembled unit weighs 8 pounds for stable, permanent duct mounting

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for rectangular ducted forced-air HVAC zoning systems accepting a two-position, three-wire actuator control signal.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor. Shut down the air handler and disconnect power to the zoning control board before wiring or mounting the damper assembly. Secure the damper frame to the duct with sheet metal screws, ensuring the actuator is accessible for future service. Wiring must comply with applicable local mechanical and electrical codes, including NEC low-voltage wiring requirements where applicable.