What is the purpose of a backdraft damper?

What is the purpose of a 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.

Are backdraft dampers necessary?

A backdraft damper is one of the minute pieces needed to help the overall function and purpose of the ventilation system do its job correctly. Without a backdraft damper in place, horrid odors that sometime infiltrate a certain room in the home would not have a way of dissipating.

What are the 3 types of dampers?

Some of the various types of dampers used in the HVAC system are mentioned below.

• Butterfly Flat Dish Damper. Butterfly dish dampers are mainly designed for high efficiency with less maintenance.
• Blade Dampers.
• Guillotine Dampers.
• Louver Dampers.
• Inlet Vane Dampers.
• 3 comments.

How does a back draft damper work?

For backdraft dampers, each blade axle runs through one side of the blade. These blades will rotate along the axle side of the blade, acting like a flap. This allows the blades to open when air pushes on one side of the damper and keeps them closed when air comes from the opposite direction.

Where do you put a backdraft damper?

Insert the backdraft damper into the duct/opening (see Figure 3). Ensure that the bottom of the damper frame sits flat on the sill of the opening/duct to prevent twisting, sagging or uplifting. Do not twist, rack or bend. Install damper plumb and square in opening.

Can I install a backdraft damper?

Dampers are built with blades designed to allow air to flow through in one direction out of the house, keeping cold air outside during the winter months. Backdraft dampers are easy to install. In fact, most home owners can do it themselves without the help of a professional.

Should a HRV have a backdraft damper?

IMPORTANT: For optimal performance of your HRV or ERV, the installation of an optional 6″ round galvanized backdraft damper is required on the fresh air to home duct work. The HRV/ERV unit should be installed in a mechanical room or as close to an outside wall as possible.

What are the six 6 types of damper?

6 Types of Industrial Dampers and When to Use Them

• Multi-Blade Control Dampers. VC-400 series opposed and parallel.
• Single Blade Dampers. VC-56 ISO damper.
• Backdraft and Pressure-Relief Dampers. PR-13 Pressure Relief Damper and BD-56 Backdraft Damper.
• Face and Bypass Dampers. Bypass Damper.
• Inlet Vane Dampers.
• Isolation Dampers.

What is an Opposed Blade damper?

Opposed blade dampers are used to regulate air flow through all Vent-Axia grilles and diffusers. Key operated. This action ensures that the downstream airflow is non-directional when the damper is in the partially closed position. Opposed blade dampers have aluminium blades and the frame is left in natural mill finish.

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. It is a one way air flow valve, designed to overcome the inefficiencies and limitations of traditional gravity or butterfly dampers.

What are the pros and cons of a backdraft damper?

The backdraft damper is well manufactured which assures you of excellent service. The springs, metal gauge and other components are well assembled to produce a nice sturdy unit. The damper does not easily deform or break. Backdraft dampers are a highly versatile feature in household ventilation.

When to put back draft dampers on exhaust duct?

Inspect the fans and add a damper if one is not already included with the fans. Install back-draft dampers where the exhaust duct meets the exhaust fan in each fan unit. The dampers should open when the fan is actively exhausting and should shut when the fan is off (Figures 1 and 2).

How is a backdraft damper used in a heat exchanger?

The backdraft damper is unique in that when air flows out of it gravity is the only source by which the backdraft damper closes and prevents contaminated air to filter back through. A backdraft damper is used on heat exchangers, exhaust systems, solar heating systems; and can be installed in…

What are louvers and Backdraft dampers used for?

Most industrial building ventilation systems designed by Eldridge incorporate louvers and backdraft dampers. Both are used to modify the free flow of air, but they have different purposes. In this article, we will discuss similarities, differences and purpose of each as well as the characteristics used to select the proper one for an application.