On-Line Catalog : Backdraft Dampers > Medium Duty > BD-64
Model BD-64 adjustable counterbalanced backdraft damper
BD-64 backdraft dampers employ counterbalanced gravity operated triple-V blades and a rugged hat channel frame to restrict reverse airflow and to permit the forward flow of air in the intended direction. Adjustable counterbalances attached to the blades permit field adjustment to regulate start-to-open and full open blade operation. The BD-64 damper may be mounted vertically or horizontally in either exhaust or intake installations for low to medium velocity and pressure applications.