What does a relief damper do?
A Barometric Relief Damper is comprised of thin metal blades, or flaps. The damper provides a low resistance path for excess air to exit the building when indoor pressure exceeds outdoor pressure.
How does a backdraft damper work?
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.
What is a gravity backdraft damper?
Backdraft dampers (also called gravity dampers) allow airflow in one direction and prevent reverse airflow for use in exhaust or intake HVAC systems. Backdraft dampers can either be operated by gravity (where pressure or velocity opens and closes the damper) or motorized to open and close when required.
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.
How does a pressure relief damper work?
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.
What is a relief hood?
Barometric Relief Hoods Barometric Hoods are designed for building pressure relief, and contain a Barometric Relief blade, or multiple relief damper blades. Therefore to relieve building pressure, a barometric hood, or hoods must be cut in to the return air duct to allow positive building pressure to be removed.
Can I install a backdraft damper?
Most of the backdraft dampers available on the market are easy to install. You can easily fit one into your vent system using minimal labor and time. This gives you savings as you are spared from having to call in a professional to do the installation.
What is yielding damper?
A metallic yielding damper (MYD) is a type of hysteretic damper made of metal that utilizes the plastic deformation of hysteretic materials, such as mild steel, to dissipate the input seismic energy. Kelly et al. More seismic energy is absorbed because of the increased damping.
What is pressure damper?
Pressure relief dampers are backdraft air dampers with an adjustable start-open 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.