Io Hvac Controls D-Z1-2018-BM Zone Damper 20x18 Bottom Mount

Product Description

The IO HVAC CONTROLS D-Z1-2018-BM is a two-position zone one damper assembly designed for rectangular duct zoning systems. It operates in fully open or fully closed positions, allowing HVAC zone control systems to direct conditioned air to specific areas of a building. The assembly ships in a bottom-mount configuration, positioning the actuator along the bottom edge of the duct collar. At 12.31 pounds and with a packaged footprint of 21 inches wide by 26 inches tall by 7 inches deep, this is a substantial assembly suited for high-volume trunk or branch duct applications. Licensed HVAC technicians performing zoning retrofits or new installations are the primary installers.

This damper assembly fits a 20 x 18 inch rectangular duct opening. It is intended for residential and light commercial forced-air zoning applications where a single zone damper is required on a primary supply or return trunk. The bottom-mount actuator placement is selected when overhead or side clearance in the plenum or duct chase is limited. It integrates with two-position zone control boards and zone panels that provide a 24-volt open or close signal to the actuator.

Key Features

• Two-position operation: fully open or fully closed for straightforward zone control
• Bottom-mount actuator configuration accommodates restricted plenum clearances
• Fits 20 x 18 inch rectangular duct openings
• Packaged dimensions of 21 x 26 x 7 inches allow pre-verification of shipping and storage clearance
• Substantial 12.31-pound construction indicates heavy-gauge damper blade and actuator housing

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for two-position rectangular duct zoning systems accepting a 20 x 18 inch damper assembly with a bottom-mount actuator.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with local mechanical codes and ACCA zoning guidelines. Shut down the air handler and de-energize the low-voltage control circuit at the zone panel or transformer before connecting or disconnecting wiring. Confirm duct framing dimensions match the 20 x 18 inch nominal opening before fastening the assembly. Do not operate the actuator manually while the damper blade is under duct static pressure.