What is barometric relief damper?

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. When a Barometric Damper is incorporated into an economizer, the outside & inside pressures often balance themselves out.

What is a carrier economizer?

Carrier’s DSRE is similar to a typical economizer with barometric relief but also integrates an additional relief plenum from the building space that bypasses the traditional barometric relief dampers. …

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.

How does a barometric relief damper work in a building?

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. A relief blade reacts to positive building pressure by forcing gravity operated relief dampers open; allowing excess air to exit the building.

How does barometric relief work in a blower?

A relief blade reacts to positive building pressure by forcing gravity operated relief dampers open; allowing excess air to exit the building. Inversely, the relief blades will seal closed under negative pressure conditions. The Barometric Damper is located on the return air side of the blower,…

How are air pressure dampers on a backdraft rated?

BD series have a galvanized steel frame with aluminum blades. The dampers are opened by air pressure differential and closed by gravity. They are rated for velocities up to 1500 fpm (7 m/s) and pressures up to 2 in. wg (0.5 kPa).

Where is the barometric damper on an indoor fan?

Inversely, the relief blades will seal closed under negative pressure conditions. The Barometric Damper is located on the return air side of the blower, and prevents the indoor fan from over-pressurizing the space. Barometric Relief is often incorporated into an economizer (See What Is An Economizer – AKA Mixing Box?