Io Hvac Controls HD-BM-NA-2018 Zone Damper 20x18 Bottom Mount

Product Description

The IO HVAC CONTROLS HD-BM-NA-2018 is a two-position zone damper designed for bottom-mount installation in forced-air HVAC duct systems. Built for a 20-by-18-inch duct opening, it accommodates a 5/8-inch to 1/2-inch shaft and ships without an actuator, allowing the installer to pair it with the actuator of their choice. The damper blade controls airflow through individual zones, enabling independent temperature management in multi-zone residential or light commercial systems. Weighing approximately 11.04 pounds, this unit is a solid, field-ready component intended for installation by licensed HVAC technicians.

The HD-BM-NA-2018 is suited for rectangular duct applications in two-position zoning systems where separate actuator selection is required. The bottom-mount configuration positions the shaft drive point at the base of the damper frame, which is common in horizontal duct runs and certain plenum installations. This configuration is frequently used in residential multi-zone forced-air systems where individual rooms or areas require independent airflow control. Installers specify this damper when they need the blade assembly separate from the actuator for custom integration or actuator substitution.

Key Features

• Fits 20-by-18-inch duct opening for rectangular duct applications
• Bottom-mount shaft drive configuration for compatibility with horizontal duct runs
• Accepts 5/8-inch to 1/2-inch shaft, accommodating common actuator shaft sizes
• Ships without actuator, allowing installer-selected actuator pairing
• Two-position operation for open/closed zone airflow control
• Sturdy construction at 11.04 pounds for stable, long-term duct installation

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for rectangular forced-air duct systems requiring a bottom-mount, no-actuator two-position damper in a 20-by-18-inch size.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out power to the air handler and any associated zone control board before mounting the damper or connecting wiring. The actuator must be sourced and installed separately; verify shaft size compatibility before ordering the actuator. Follow local mechanical codes and the equipment manufacturer guidelines for duct penetration, sealing, and fastener requirements.