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smoke shelf

a ledge at the bottom of a smoke chamber, so made as to deflect or break downdrafts from the chimney.
Also called wind shelf. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for smoke shelf
  • Clean off the smoke shelf above the damper from inside, working from the fireplace opening.
  • And for ease of construction the firebox and smoke shelf can be formed in plywood and burnt out later.
  • Remove the drop-cloth and clean off the smoke shelf above the damper by working from inside the fireplace opening.
  • If not, it may ignite material that's up there on the smoke shelf or ignite creosote in the chimney.

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