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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

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.

Watch the product video on YouTube.


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?
  3. 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.

  4. Is a dryer strong enough to open the damper on the 4"?
  5. 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.

  6. Would this work with a on demand hot water heater with no forced exhaust .
  7. 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
Showing 1 of 65 reviews (2 star). See all 65 reviews
  1. 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.

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