Io Hvac Controls HD-BM-NA-3220 Zone Damper 32x20

Product Description

The IO HVAC CONTROLS HD-BM-NA-3220 is a two-position zone damper sized at 32 x 20 inches, designed for bottom-mount installation without an actuator included. It accepts a 5/8-inch to 1/2-inch shaft and controls airflow in a single zone of a ducted HVAC system. Zone dampers like this one open and close to direct conditioned air where it is needed, allowing a zoned forced-air system to respond to individual thermostat calls. The unit ships at 17.04 pounds. Licensed HVAC technicians and sheet metal contractors install this component during new system buildouts or zone-control retrofits.

This damper is suited for residential and light commercial zoning applications where duct sizes require a large-format blade. It mounts to the bottom of the duct assembly and is paired separately with a compatible actuator, giving the installer flexibility to select the appropriate actuator for the control system in use. Typical installations place this damper in a trunk line or large branch duct feeding a dedicated zone controlled by a zone control board and a low-voltage thermostat.

Key Features

• Two-position operation for open/closed zone airflow control
• Large 32 x 20 inch blade size for high-capacity duct runs
• Bottom-mount design for flexible duct-side installation positioning
• Ships without actuator, allowing selection of a compatible actuator separately
• Accepts 5/8-inch to 1/2-inch shaft for actuator coupling

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for ducted residential and light commercial forced-air zoning systems requiring a 32 x 20 inch bottom-mount damper with a 5/8-inch to 1/2-inch shaft.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal contractor. Shut down the air handler or furnace and set the system to the off position at the thermostat and disconnect before beginning work. The actuator is not included and must be sourced and mounted separately; verify actuator shaft compatibility with the 5/8-inch to 1/2-inch shaft before ordering. Low-voltage wiring to the actuator must comply with NEC requirements and the zone control board manufacturer specifications.