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FAMCO Butterfly Backdraft Damper. Plain metal finish and color
FAMCO Butterfly Backdraft Damper. Plain metal finish and color
FAMCO Butterfly Backdraft Damper Specifications Sheet With Descriptions
Side view of FAMCO butterfly backdraft damper while open, in galvanized steel.
FAMCO Butterfly Backdraft Damper - Galvanized Steel (Side View)

Butterfly Backdraft Damper

(65 customer reviews)

$39.95 – $199.95

  • Quality constructed from heavy-duty galvanized steel: 28-22 gauge, depending on size (see more details below) with lightweight aluminum damper blades.
  • Used as a backdraft damper for heat exchangers, exhaust systems, solar heating systems and other intake or exhaust applications where a powered damper is not needed, this product is not rated for use with a dryer.
  • Works in both horizontal or upward air flow positions and the foam seal provides minimal air leakage
  • Opens easily with normal air flow and closes with gravity, due to the specially designed angled aluminum damper blades
  • Available for duct sizes ranging from 4 inch to 20 inch

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SKU BD Categories ,

Description

The FAMCO BD butterfly backdraft damper is used as a backdraft damper for heat exchangers, exhaust systems, solar heating systems and other intake or exhaust applications where a powered damper is not needed, this product is not rated for use with a dryer. 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 from heavy-duty galvanized steel, sizes 4-6 inch are 28 gauge, sizes 8-12 inch are 26 gauge, size 14 inch is 24 gauge, and sizes 16-20 inch are 22 gauge. The FAMCO BD butterfly backdraft damper comes in sizes ranging from 4 inch to 20 inch. 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 product, please refer to the FAQs above or feel free to contact us.

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PDF Download

Download the BD product PDF.

Spec Sheet

Print Spec Sheet

Butterfly Backdraft Damper

SKU: BD

Questions and answers of the customers

    Will the 4" damper work if the whole unit is installed vertically? Or does the unit need to be installed horizontally in order to function properly?
  1. Q Will the 4" damper work if the whole unit is installed vertically? Or does the unit need to be in...... Read more answer now
    Asked on February 13, 2021 4:46 am
    A

    This unit is designed to be installed horizontally in order to function properly.
    2. Can this damper (7" diameter) be used in the exhaust from a kitchen range hood?
  2. Q Can this damper (7" diameter) be used in the exhaust from a kitchen range hood? answer now
    Asked on January 26, 2021 2:07 pm
    A

    Yes - this damper can be used with a kitchen range hood exhaust duct.
    3. Is a dryer strong enough to open the damper on the 4"?
  3. Q Is a dryer strong enough to open the damper on the 4"? answer now
    Asked on December 21, 2020 4:20 am
    A

    This product is not rated for use with a dryer, as the foam gasket may trap lint and pose a fire risk.
    4. Would this work with a on demand hot water heater with no forced exhaust .
  4. Q Would this work with a on demand hot water heater with no forced exhaust . answer now
    Asked on October 21, 2020 6:22 pm
    A

    Yes - this damper can be used with water heaters

65 reviews for Butterfly Backdraft Damper

4.9
Based on 65 reviews
5 star
93
93%
4 star
4
4%
3 star
0%
2 star
1
1%
1 star
0%

  1. Bob –

    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. Sheila –

    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. 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. lvmopt –

    Excellent 4 inch backdraft vent

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

  5. Leonard Ford (verified owner) –

    Works nice.

  6. Amrish Patel (verified owner) –

  7. 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. 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. R ALLEN (verified owner) –

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

  10. Blaise M. (verified owner) –

    Excellent product. Easy to install.

  11. Anonymous (verified owner) –

    Very well made. Would buy it again

  12. steve s. (verified owner) –

    good price quality and fast shipping

  13. Daniel S. (verified owner) –

    Product works as designed.

  14. Steve Morley (verified owner) –

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

  15. John B. (verified owner) –

  16. Steven (verified owner) –

  17. Scott MCCALL (verified owner) –

    Excellent product and service!!

  18. James (verified owner) –

    Solved backdraft problem with the air return. Quality product.

  19. John H. (verified owner) –

    I received the wrong size when it was first shipped to me. The packing slip said it was the size I ordered but what came in the box was the wrong size. I called and they sent the correct size by overnight freight.

  20. BELINDA DYSON (verified owner) –

  21. Anonymous (verified owner) –

  22. Anonymous (verified owner) –

    Opens on lowest fan setting. Seals completely.

  23. William (verified owner) –

    quality looks very good, delivery was good

  24. John Garbarino (verified owner) –

  25. Dale B. (verified owner) –

  26. Jordan H. (verified owner) –

    Very easy to order from. Good packing. Nice damper.

  27. Brooks (verified owner) –

    I got just what I wanted. Thanks.

  28. Anonymous (verified owner) –

  29. Michael L. (verified owner) –

  30. Carl Gothan (verified owner) –

    Best service ever

  31. Gregory (verified owner) –

    Perfect. The item was as described and works great.

  32. Jorge Vásquez (verified owner) –

  33. Steve (verified owner) –

    Very impressed with the damper. Installed it between sections of the vent piping for a new range hood. Seems well designed, does an excellent job preventing back drafts, and creates little if any additional noise when the range hood fan is running.

  34. DAVID CONNOLLY (verified owner) –

    worked perfectly thank you

  35. Anonymous (verified owner) –

    Fast shipping nice customer support

  36. BELINDA D. (verified owner) –

    Terrific product. Flawless service.

  37. Anonymous (verified owner) –

  38. Eugene Williams (verified owner) –

  39. Anonymous (verified owner) –

  40. Andy S. (verified owner) –

    nicely made!

  41. Barry (verified owner) –

  42. Thomas O’Rourke (verified owner) –

    Like that it’s made in USA, quality work and very good packaging.

  43. William Minnick (verified owner) –

  44. Anonymous (verified owner) –

  45. Anonymous (verified owner) –

    Nice service and good prices, Thanks.

  46. MEHUL B. (verified owner) –

  47. Robbin Short (verified owner) –

    very nice product, fits like it should and works great, I would buy from them again!

  48. Chris N. (verified owner) –

    Exactly what I was looking for and works perfectly. Very pleased

  49. Martin E. (verified owner) –

  50. Tommy Taylor (verified owner) –

  51. vachon alain (verified owner) –

    excellent

  52. Anonymous (verified owner) –

  53. Thomas P. (verified owner) –

  54. Timothy B. (verified owner) –

  55. Kim Williams (verified owner) –

    These are exactly what we needed to stop back flow from the house furnace and air conditioner to our outside wood burning stove.

  56. David V. (verified owner) –

  57. Greg F. (verified owner) –

    Good quality and works perfect, Easy install.

  58. James K Armstrong (verified owner) –

    Looked like great quality and will do exactly what I need.

  59. Vince K. (verified owner) –

    Works as advertised

  60. Tong Ginn (verified owner) –

    I had tried another damper but the fluting did the trick for me.

  61. Richard (verified owner) –

  62. Sheila Lenz (verified owner) –

    Always on time. Always quality. Our #1 vendor for venting.

  63. Jordan H. (verified owner) –

    Super good quality!

  64. Anonymous (verified owner) –

    I was very pleased that FAMCO would make this damper in the unusual size I needed, but…..

    The foam strip that seals the flap was installed crooked so that there was a 3mm gap on nearly half the circumference. I had to rebuild this with new foam, but suboptimal performance because I didn’t really have the right foam for this.

    In addition, the cloth tape that is used to form the butterfly hinge was improperly trimmed so that it rubbed against the inside of the metal tube and one flap didn’t close all the way. This was easy to fix by trimming with a razor, but still I’d expect better — if I hadn’t been fiddling with this area to fix the foam issue, I probably would have installed this damper without noticing and the client would have had a lifetime of leaks without knowing why.

    • Kavan Martin (store manager) –

      Thank you for the review! I have forwarded your review to our team so we can look into this quality concern.

  65. Michael (verified owner) –

    It’s made to perfection!

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FAMCO prides itself on Quality Built Products manufactured from quality raw materials. All products are guaranteed to be free of defective material or workmanship for a period of one year from the date of delivery. During the guarantee period, if any parts prove defective, they will be replaced free of charge. Please click here to review a complete version of our limited warranty.
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