Io Hvac Controls HD-NA-1820 Zone Damper 18x20 No Actuator

Product Description

The IO HVAC CONTROLS HD-NA-1820 is a two-position zone damper sized at 18 x 20 inches, supplied without an actuator and configured for a 5/8-to-1/2-inch shaft. Zone dampers are installed inside ductwork to control airflow to individual zones in a multi-zone HVAC system. This damper opens and closes in response to zone calls from a zone control panel, directing conditioned air where it is needed and shutting off flow to idle zones. At 14 pounds, it is a substantial assembly suited for commercial-grade or larger residential zoning applications. Licensed HVAC technicians and sheet metal contractors are the typical installers.

This damper is designed for use in forced-air zoning systems where the actuator is sourced or already installed separately. The no-actuator configuration allows integration with a contractor-supplied actuator that matches the existing system design. Typical install scenarios include new multi-zone residential systems and commercial rooftop-unit zoning retrofits where the installer specifies the actuator independently. The 18 x 20 inch blade size fits larger trunk or branch ducts common in light-commercial and larger residential installations.

Key Features

• Two-position operation: fully open or fully closed for straightforward zone control
• Supplied without actuator, allowing the installer to select a compatible actuator separately
• 5/8-to-1/2-inch shaft configuration for flexible actuator mounting
• 18 x 20 inch blade size suits larger duct openings in residential and light-commercial systems
• 14-pound assembly constructed for durable in-duct service
• Overall cabinet dimensions of 23 x 25 x 10 inches allow for accurate rough-in planning

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for forced-air multi-zone HVAC systems requiring an 18 x 20 inch two-position damper with a 5/8-to-1/2-inch shaft; actuator must be sourced and matched separately.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor. Shut down and lock out the air-handling unit before mounting the damper in the duct. Confirm actuator shaft compatibility before final assembly, and verify that the zone control panel output signal matches the actuator being used. Follow local mechanical codes and manufacturer wiring guidelines when connecting the actuator to the zone control board.

Technical Specifications

• Blade Size: 18 x 20 inches
• Shaft Size: 5/8 to 1/2 inches
• Actuator Included: No
• Operation Type: Two-Position
• Overall Dimensions (W x H x D): 23 x 25 x 10 inches
• Weight: 14 pounds

Standard Information

• Brand: IO HVAC CONTROLS
• Manufacturer Part Number: HD-NA-1820