Io Hvac Controls HD-NA-2418 Zone Damper 24x18 No Actuator

Product Description

The IO HVAC CONTROLS HD-NA-2418 is a two-position zone damper sized at 24 x 18 inches, designed for use in forced-air HVAC zoning systems. Supplied without an actuator, this damper accepts a 5/8 to 1/2 inch shaft and is intended for installations where the contractor sources or reuses a compatible actuator separately. Zone dampers like this one control airflow to individual zones, allowing a zoning control board to open or close duct sections in response to individual thermostat calls. At 13.04 pounds, the HD-NA-2418 is a substantial, duct-grade component suited for residential and light commercial trunk-and-branch or plenum-bypass duct systems.

This damper is a fit for forced-air zoning applications where a 24 x 18 inch rectangular duct opening is present. It is typically installed by licensed HVAC technicians during new zone system construction or as a replacement in existing multi-zone setups. The no-actuator configuration makes it appropriate when pairing with a specific two-position or modulating actuator already on hand, or when upgrading damper blades without replacing the drive assembly. Residential and light commercial systems with multiple independently controlled zones are the primary install scenario.

Key Features

• 24 x 18 inch rectangular damper sized for standard trunk duct openings
• Two-position operation - fully open or fully closed for zone control
• Supplied without actuator, allowing pairing with a separately sourced drive
• 5/8 to 1/2 inch shaft compatibility for flexible actuator mounting
• Weighs 13.04 pounds, indicating heavy-gauge duct-grade construction

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for rectangular forced-air duct systems requiring a 24 x 18 inch two-position damper with a 5/8 to 1/2 inch actuator shaft.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect power to the air handler and all zone control equipment before installing or servicing the damper. Because this unit ships without an actuator, verify shaft size and actuator torque requirements before mounting the drive assembly. Follow all applicable mechanical and building codes for duct penetrations and zoning system wiring.