Trench Cut Roof Ventilation

Delmar handbook 3rd edition pages 643 668. Large vent h over fire area. The trench is often improperly used as fire officers and incident commanders forget that this operation does not replace the need for a primary vent hole over the fire area.

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Open the trench and operate hoselines.

Trench cut roof ventilation.

Ventilation trench cut firefighter training references. Discuss is the trench cut an offensive or a defensive operation. 2 observation cuts between fire area and determined trench location. 5 when fire shows from observation cuts.

The trench cut otherwise known as strip ventilation is a long narrow ventilation hole that acts as a fire break on the roof of a structure that is being attacked by fire. Cut trench at narrow point and pull ceiling but do not pull trench. A trench is cut at least 20 feet from the main vent hole and. A trench is cut after the main ventilation hole is cut and extended and inspection holes are made to monitor extension in the cockloft.

Position hose lines underneath and above.

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