Io Hvac Controls D-20 Round Zone Damper 20 in 2 Wire

Product Description

The IO HVAC CONTROLS D-20 is a heavy-duty 20-inch round zone damper designed for two-position airflow control in ducted HVAC zoning systems. It ships with a 2-wire actuator, making wiring straightforward for standard open/close zone control applications. At 15 pounds, this is a substantial damper built for high-volume duct runs. Licensed HVAC technicians install this damper when splitting a single air handler across multiple zones, using a zone control board to sequence damper positions and maintain comfort in each area of the building.

This damper is suited for residential and light commercial forced-air zoning installations where a 20-inch round duct trunk or branch is present. The HD/GMA designation indicates heavy-duty and general mechanical application construction, making it appropriate for installations that see high static pressure or frequent cycling. It fits into zoning setups alongside compatible zone control panels and thermostats, delivering reliable two-position operation for each zone circuit.

Key Features

• 20-inch round damper blade fits standard 20-inch round duct openings
• Two-position operation: fully open or fully closed for straightforward zone control
• 2-wire actuator included, simplifying low-voltage wiring to the zone control board
• Heavy-duty HD/GMA construction rated for high static pressure and frequent cycling
• 15-pound build quality indicates robust metal damper body and actuator assembly

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for ducted residential and light commercial forced-air zoning systems using 20-inch round duct configurations and two-position zone control boards.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with forced-air zoning systems and low-voltage control wiring. Power down the air handler and zone control panel before making any wiring connections to the actuator. The damper body should be secured to the duct with sheet metal screws and sealed with foil tape or mastic per local mechanical code requirements. Verify actuator travel and damper blade seating before restoring power and commissioning the zone system.