Flashcards in Essentials Ch 13 Deck (17):
Incident Stabilization means controlling and extinguishing the fire and is accomplished in three stages:
Fire behavior indicators that relate to tactical ventilation are:
Volume of smoke discharge
Location of smoke discharge
Smoke color, density and pressure
Movement of smoke
Air flow is caused by:
Pressure differentials inside and outside a compartment
Differences in density between the hot smoke and cooler air
Which type of device uses only electricity to power for ventilation (blower vs smoke ejector)?
Smoke ejector requires electricity
The means used for horizontal and vertical ventilation are:
Natural (opening doors/Windows)
Mechanical (fans, blowers, ejectors)
Hydraulic (fog nozzle)
Leeward side is the side:
Protected side from the wind (opposite side from the wind direction)
Leeward or windward side is opened first for natural horizontal ventilation?
Leeward should be opened first to create an exit point
Negative pressure uses:
Ejector to pull smoke from a compartment to exhaust the smoke
When using hydraulic ventilation how much coverage is targeted on the opening / how far back is the nozzle?
85 - 90% of the opening, 2 feet back
Advantages of mechanical ventilation:
Supplements and enhances natural ventilation
Ensures more control of air flow
Speeds the removal of contaminants
Reduces smoke damage
Promotes good public relations
Disadvantages of mechanical ventilation:
Can cause a fire to intensify and spread
Depends upon a power source
Requires special equipment
Requires additional resources and personnel
For vertical ventilation, an inspection hole is cut to help determine:
The location of a ire and the direction of travel of a fire that is located in an attic or cockloft.
Kerf cut (single cut the width of the saw blade)
'A' cut (triangle)
How far ahead of advancing fire is a trench cut made (defensive strategy)?
At least 30 feet ahead of advancing fire (3 - 4 ft wide) only after an offensive opening has been made as to not pull fire to the trench.
The personnel required for search and rescue and fire fighting operations in highrise blgs is often _____ to _____ times as great as required for a fire in a typical low rise bldg.
4 - 6 times as great
A building's smoke control system is designed to confine a fire to as small an area as possible by _________ the building when smoke or fire is detected.