Chapter 9 Ventilation Flashcards
What are the two main reasons for performing ventilation
Venting for fire
Venting for life
What to evaluate when moving up interior stairs to areas above the fire?
are there civilians trapped?
alternate escape routes or entrance points?
hoseline in place on the fire?
In a fire resistive building when do you vent the compartment?
after the hosestream has thoroughly cooled the fire area
After the placement of the initial attack hoseline and designation of an interior search team what is the next most crucial position to be covered?
outside ventilation
What is the outside vent team responsible for?
immediate exterior survey of the structure
locating victims
locating the seat of the fire
creating firefighter escape routes
What are the methods of mechanical ventilation?
Hoselines
portable fans
building ventilation systems
Which type of mechanical ventilation is the least demanding on personnel and is one of the easiest and simplest forms?
hosestream with fog or spray pattern
What affects how much air and smoke a hosestream can carry out during mechanical vent?
volume of water
velocity of water
What degree of fog pattern is best for mechanical vent?
30 degrees
What effect is caused by spraying fog stream out a window or opening?
venturi
What is the effect called when the vent fan is improperly placed the the opening?
Churning effect
What is the desired distance to set the vent fan from the opening?
8-12 feet
How much more air can a fan blow than suck out of a building?
twice as much or half the time
How do you stop positive power vent fan?
Turn fan 90 degrees away from the door
What is the most common vertical artery in a structure?
Staircase
