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butterfly damper

noun
1.
a damper, as in a flue, that rotates about a central axis across its face.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for butterfly damper
  • butterfly damper shall be low leakage and non-binding.
  • In addition, a butterfly damper is located on the outlet side of the blower.

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