On-Line Catalog : Backdraft Dampers > Light Duty > Butterfly Blade > BD-20
Model BD-20 backdraft damper
butterfly style blade
BD-20 backdraft dampers employ gravity operated butterfly style blades to restrict reverse airflow and to permit the forward flow of air in the intended direction. The BD-20 damper may be mounted vertically or horizontally in either exhaust or intake installations for low velocity and pressure applications.