Resideo by Honeywell ARD20TZ 24V Automatic Round Damper 20 Inch Normally Open

The Resideo by Honeywell ARD20TZ is a 24-volt automatic round damper designed for residential and light commercial HVAC zoning applications. This 20-inch diameter damper is part of the TrueZONE system and features a normally open configuration, meaning the damper remains open when power is not applied and closes when energized.

Key Features:

• 20-inch round duct size for medium to large airflow applications
• 24VAC operation with low power consumption
• Normally open design—fails in the open position for safety
• Spring return mechanism ensures reliable operation
• Dual-blade design provides smooth, quiet operation
• Compatible with TrueZONE control panels for multi-zone HVAC systems
• Heavy-duty galvanized steel construction for durability
• Factory-installed foam gasket minimizes air leakage

This automatic damper integrates seamlessly with zoned HVAC systems to control airflow to different areas of a building. When used with a compatible zone control panel, the ARD20TZ opens and closes to regulate conditioned air distribution, improving comfort and energy efficiency. The normally open configuration ensures that even in the event of a power failure or control system malfunction, the damper will default to the open position, maintaining airflow to the zone.