Pressure-relief dampers open and close automatically. The blades are kept closed by magnets. If the differential pressure exceeds the set maximum value, the magnetic force is overcome, and the blades open. The airflow by which the excess pressure has been caused can now flow through the damper.
How do you select a pressure relief damper?
When selecting the correct damper for your application, you need to know: • System velocity and back pressure requirements. Mounting orientation and airflow direction. Mounting Type (Wall mounted/Duct mounted/Flush mounted) • Damper operation (gravity or motorized) • Start-open pressure.
What is a gravity backdraft damper?
Backdraft dampers, also known as gravity dampers, are used in ventilation systems to allow airflow in one direction and prevent airflow in the opposite direction.May 25, 2021
What is a backdraft damper for exhaust fan?
Backdraft dampers allow air to efficiently flow through exhaust ducts to the outside, yet prevent the unwanted flow of air into a house when the exhaust fans are off. They stop cold air from coming in, allowing a more comfortable temperature in your home.May 18, 2016
How does a barometric bypass damper work?
The barometric bypass dampers relieve excess air in duct systems through the use of a counter-balanced controlled arm weight. ... The weight can be moved either direction along the entire length of the arm to allow the damper to open at the desired pressure.
What is gravity relief damper?
Backdraft dampers (also known as gravity dampers) are used in ventilation systems to allow airflow in one direction and prevent airflow in the opposite direction. A relief damper is developed with an elevated and adjustable start-open pressure while providing the backdraft function.
What is a barometric damper HVAC?
Pressure Relief / Barometric Damper The FAMCO Pressure Relief Damper (often called a Barometric Damper) is commonly used to relieve built up pressure in zoned duct system that could potentially cause damage to HVAC equipment. The sliding weight can be adjusted to open when a certain pressure is reached.
What does a pressure relief damper do?
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.