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DDRD Series Round
Barometric Relief Dampers
Our most popular relief dampers due to low cost and ease of installation. The DDRD Series barometric relief damper comes installed in a round sheet metal enclosure similar to a motorized damper. This relief damper features an adjustable, weighed arm used to increase and decrease air flow resistance. A 12" barometric relief will handle up to a 5 ton unit. Our unit features a longer arm than most for better airflow adjustment. Extra weights are available. Use flexible or rigid duct with starting collars for easy installation.
Application: Residential and light commercial zoning systems 5 ton and under.