spark arrester

a device, consisting of wire netting or other material, used to stop or deflect sparks thrown from an open fireplace, a smokestack, or the like.
Electricity. a device to reduce sparking at contacts where a circuit is opened and closed.

1825–35, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
spark arrester   (spärk)  Pronunciation Key 
  1. A device designed to keep sparks from escaping, as at a chimney opening or where materials are being welded.

  2. A device used to control or curtail electric sparking at a point where a circuit is made or broken.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Final inspection includes spark arrester and flashing around chimney.
Also banned are smoking outside of an enclosed vehicle and operation of any motor without an approved and working spark arrester.
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