Pressure Relief Dampers

Backdraft dampers with adjustable start-open pressure.

Pressure relief dampers are backdraft air dampers with an adjustable start-open pressure. This provides the capability of maintaining a relative constant pressure at various airflows. The damper closes when there is a decrease in differential pressure. This damper is generally used as a safety or controlling device. For example, mounting this damper on a duct section would relieve unexpected overpressure or relieve negative pressure downstream of a rapidly closing fire damper.