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Stringfield73 Stringfield73
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Posts: 780
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6 years ago
When the main body of the fire is too great to extinguish, and only after the offensive vertical ventilation opening has been made, a trench cut must be created ahead of the advancing fire by at least:
 
  A. 10 feet.
  B. 20 feet.
  C. 30 feet.
  D. 40 feet.
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6 years ago
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