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Backdraft Dampers

Simple Solutions to Complex Airflow Problems

Backdraft dampers prevent unwanted reverse airflow by allowing air to exit the system but not re-enter. Their unique design includes a foam seal that ensures minimal air leakage and allows the damper to operate effectively in both horizontal and vertical positions. 

FAMCO backdraft dampers are available in galvanized steel. We offer multiple styles to suit both residential and commercial ventilation needs.

  • FAMCO Butterfly Backdraft Damper. Plain metal finish and colorFAMCO Butterfly Backdraft Damper. Plain metal finish and color
    HVAC Dampers

    Butterfly Backdraft Damper

    Rated 4.91 out of 5
    $46.95$226.95 Select options This product has multiple variants. The options may be chosen on the product page
  • Top-down shot of FAMCO Inline Butterfly Backdraft Damper in galvanized steel, closed.Top-down shot of FAMCO Inline Butterfly Backdraft Damper in galvanized steel, closed.
    HVAC Dampers

    Inline Butterfly Backdraft Damper with Spring – Galvanized

    Rated 4.94 out of 5
    $36.95$57.95 Select options This product has multiple variants. The options may be chosen on the product page
  • Side-by-side comparison of FAMCO backdraft damper and wall vent.Side-by-side comparison of FAMCO backdraft damper and wall vent.
    Backdraft Dampers

    Galvanized Wall Vent – Reversible Backdraft Damper

    Rated 4.57 out of 5
    $73.95$147.95 Select options This product has multiple variants. The options may be chosen on the product page
  • Square metallic vent hood with a circular mesh opening in the center.Square metallic vent hood with a circular mesh opening in the center.
    HVAC Dampers

    Aluminum Wall Vent – Reversible Backdraft Damper

    Rated 5.00 out of 5
    $73.95$147.95 Select options This product has multiple variants. The options may be chosen on the product page

Technical Information

Benefits

Energy Efficiency
Allows precise control over the temperature in different zones of a home or building.
Moisture Control
Protect HVAC equipment from pressure build-up, helping to prevent potential damage to the system.
Improved Air Quality
Prevents reverse airflow, preventing unwanted air from re-entering the system.
Residential and Commercial Uses

Residential Use:

Essential for regulating  the movement of air without compromising air quality in specific zoning areas.

Commercial Use:

Designed for areas that experience varying airflow patterns or where air needs to be directed in a specific manner.

Product Highlights

Butterfly Backdraft Damper:

Designed for heat exchangers, air exhaust systems, and HVAC applications where powered dampers are not needed. This damper works in both horizontal and upward air flow positions, featuring a foam seal for minimal air leakage and angled aluminum blades.

Galvanized Wall Vent (Reversible Backdraft Damper):

Features a gasketed backdraft damper that can be positioned for either intake or exhaust, along with an ⅛ inch insect screen to prevent pests, and an angled hood design for optimal airflow. 

Galvanized Inline Butterfly Backdraft Damper with Spring: 

This damper works efficiently in both horizontal and vertical positions, featuring a foam seal that ensures minimal air leakage. It is highly rated for its reliable performance in air exhaust systems.

Backdraft Dampers Installation Tips

Proper Placement:

Install backdraft dampers where pressure build-up is likely to occur. These dampers can be integrated with zone controllers to automate airflow management. Make sure to check that the damper is correctly oriented to allow air to flow in the desired direction and that the foam seal is intact to minimize any leakage. 

Damper Selection:

Choose dampers based on climate and specific ventilation needs. 

Professional Installation:

While some dampers may be installed by DIYers, professional installation is recommended for complex systems or areas with challenging access.

Frequently Asked Questions

Backdraft dampers prevent the reverse flow of air (or backdraft) in an HVAC system or ventilation duct. These dampers automatically close when air flows in the wrong direction, such as when wind or changes in pressure force air back into the system. 

When choosing the right backdraft damper, make sure the damper matches the size of the ductwork to ensure effective airflow control. In addition, choose a backdraft damper made of durable materials like galvanized steel.

At FAMCO, we provide a one-year customer satisfaction guarantee for our backdraft dampers, which includes coverage for manufacturing defects. If you experience any issues or defects with the dampers, contact our customer support team for assistance.

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