Butterfly Backdraft Damper

Rated 4.94 out of 5 based on 16 customer ratings
(16 customer reviews)


Category: HVAC Damper – Subcategory: Backdraft Material: Galvanized Steel – Finish: Mill – Thickness: 28 Gauge Shape: Round – Dimensions: 4″, 5”, 6″, 7″, 8″, 9″, 10″, 12″, 14”, 16″, 18″, 20″ – Sku: BD

SKU: BD Categories: ,

The FAMCO BD Butterfly Backdraft Damper is used as a back draft damper for heat exchangers, exhaust systems, solar heating systems and other intake or exhaust applications where a powered damper is not needed. This damper works in both horizontal or vertical positions and the foam seal provides minimal air leakage. Due to its unique design and Aluminum blades, it opens easily with normal air flow and closes with gravity. Quality constructed Galvanized steel, gauges 28 to 22. The FAMCO BD Butterfly Backdraft Damper comes in sizes 4 inch, 5 inch, 6 inch, 7 inch, 8 inch, 10 inch, 12 inch, 14 inch, 16 inch, 18 inch and 20 inch. Spec sheet available for download. The FAMCO BD Butterfly Backdraft Damper is manufactured by Famco in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this damper, please refer to the FAQs above or feel free to contact us by phone or email.

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Download the BD product PDF.
Print Spec Sheet

Butterfly Backdraft Damper


16 reviews for Butterfly Backdraft Damper

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  1. Rated 5 out of 5


    4″ Butterfly damper perfect for “supply air”

    We use these when sealing a crawlspace or attic. As an insulation contractor, we use spray foam to encapsulate & insulate these areas for homeowners. The 4″ damper is inserted into an HVAC supply plenum, so that the HVAC conditions the area, and aids in the control of high RH.

  2. Rated 5 out of 5


    Excellent quality and service

    FAMCO has excellent customer service and their product is always exactly as stated. Our company has ordered several of the 6″ dampers and they work perfectly.

  3. Rated 5 out of 5

    Sheila Lenz

    Butterfly Backdraft Damper

    This is a very good product. It is made to specifics and is exactly as stated.
    We are doing a fairly large industrial project and have purchased several of these this year. We have had no problem with this product.

  4. Rated 5 out of 5


    Excellent 4 inch backdraft vent

    This item fits well and does its job. Very happy.

  5. Rated 5 out of 5

    Leonard Ford (verified owner)

    Works nice.

  6. Rated 5 out of 5

    Amrish Patel (verified owner)

  7. Rated 5 out of 5

    keven nguyen (verified owner)

    Item is well built and sturdy. I’m using this to built a whole house fan. Shipping was fast too! I would recommend buying from FAMCO.

  8. Rated 5 out of 5

    Stephen E. (verified owner)

    I haven’t installed it yet but it looks great
    Well constructed and operates very smoothly
    Great communication letting me know as things happen and very fast service

  9. Rated 5 out of 5

    R ALLEN (verified owner)

    Built and shipped quickly. Plenty of email notices to keep me updated. Thanks!

  10. Rated 5 out of 5

    Blaise M. (verified owner)

    Excellent product. Easy to install.

  11. Rated 5 out of 5

    Anonymous (verified owner)

    Very well made. Would buy it again

  12. Rated 5 out of 5

    steve s. (verified owner)

    good price quality and fast shipping

  13. Rated 4 out of 5

    Daniel S. (verified owner)

    Product works as designed.

  14. Rated 5 out of 5

    Steve Morley (verified owner)

    Well built, on time delivery. I like these products. Better than the local products.

  15. Rated 5 out of 5

    John B. (verified owner)

  16. Rated 5 out of 5

    Steven (verified owner)

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