chapter 9 Flashcards
Which type of ventilation is being undertaken when the
products of combustion are pulled out by a fan?
Negative pressure
Which is the best location to use the hoseline for
ventilation efforts?
Medium fires in a residential building
How long is the kerf cut generally made?
10 inches
What type of roof is built over an existing one when the
older roof leaks?
Rain
What shape holes should be placed at the corners of the
roof section to be cut that will allow pike poles to be
inserted to assist in pulling the roof?
Triangle
What angle does the 2X4 join the top plate in an inverted
roof?
90 degree
What tips off firefighters to the presence of a bowstring
truss roof?
Dome shape roof
What part of the staircase should the firefighter avoid
touching?
Banister
Which of the following is true when venting for life?
Take out the windows
Which of the following actions is strictly forbidden when
extending the hole in the roof?
Using hoseline in the hole
Which type of ventilation requires more manpower?
Vertical
What must be done before the trench is cut to help ensure
its success?
Primary vent hole cut
What is the shape of the fastest type of examination hole?
Straight line
What size hoselines need to be used to combat and win
against a metal deck roof fire?
2 1/2-inch
What is the second most common vertical avenue for fire?
Pipe chase
What pattern is the steel bar joist bent into for the
metal deck roof?
Z
How should a firefighter proceed when the fire and heat is
driving toward him on the roof?
Crawl
Which of the following is better indicator of where the
fire is located below the roof?
Fire
What can cooling the metal deck roof’s ceiling help
prevent?
Metal deck roof fire
How wide are the Insulpan panels generally?
8 feet
How far from the desired opening is the fan placed when
performing positive pressure ventilation?
10 feet
Which of the following is NOT part of mechanical
ventilation?
Opening the roof
What makes the truss roofs the most dangerous for
firefighters to deal with?
Lightweight design
What type of force is acting upon the bottom chord of a
truss?
Tensile
Which type of truss is the most deadly per incident?
Bowstring
How far from the main vent hole should the trench cut be
placed?
20 to 25 feet
What is one of the earliest and simplest means of
mechanical ventilation that can be performed?
Fog pattern
What position should members ascending the staircase hold
their heads when a skylight will be removed?
Looking straight
Which of the following would benefit from vertical
ventilation?
Cockloft fire
How far apart should the cuts be made when performing a
trench cut?
3 feet
How far apart are the main support beams in the old-style
roof construction?
16 inches
What should be the maximum size hole cut when subdividing
the hole before starting to pull the roofing?
4X4 foot
Which windows should be opened when using positive
pressure ventilation?
Those in the room to be vented
How is the decking laid in relation to the bar joists in
the metal deck roof?
Perpendicular
What is the last thing that should be done when venting
the old-style flat-roof?
Vent the roof
How far into the member does the gusset plate penetrate?
1/4-inch
How far from the intended edge of the trench should
examination holes be made?
5 or 6 feet
Which type of ventilation is being performed when windows
are broken out?
Horizontal
What is the most effective fog pattern used when
performing mechanical ventilation with a hoseline?
30 degree
What type of ventilation is best to move cold smoke?
Mechanical
What is the most common vertical artery that is
encountered in fire suppression activities?
Staircase
What should be done with the soil pipes to determine if
there is a fire threat in the attic?
Feel them
What is a common problem for smoke ejectors and hoselines
when performing ventilation?
Forced draft over embers
How many pieces within the truss design need to fail
before the entire truss may collapse?
1
Which of the following is NOT part of every truss?
Bowing
What is the maximum distance above the roof that a
firefighter should allow a spinning blade to be to prevent
injuries?
6 inches
What will happen when a wood joist is sounded by a tool?
No bounce
How much more smoke can be moved using positive pressure
than negative pressure ventilation?
Two times as much
When should windows be broken in relation to the hoseline
attack?
Just as it begins
Which of the following is NOT generally a concern when
performing PPV?
Curtains in the area
What type of operation is the use of trench cuts?
Defensive
Which type of beam is used to ensure the floors will not
squeak, but gives without warning under fire conditions?
I-beam
What is the answer when fire has taken over void spaces in
a structure?
Complete ventilation
What is the maximum distance that the standard wooden beam
can be spanned?
25 feet
Which type of roof has its main roof supports at the roof
level?
Standard flat
Where must the firefighters enter a building when PPV is
being used?
Location of the fan
What is the key to determining if ventilation is for life
or fire?
Timing
Which of the following is NOT a complication presented by
the Insulpan panels?
Common cockloft
Which of the following conditions yields more space to
advance a hoseline?
Broken window
How wide can the metal decking be that is used to
construct metal deck roofs?
6 feet
What should be the guiding force when deciding to open a
window or break it?
Heat
What place in the multi-winged apartment building is the
best place to attempt to cut off the fire?
Throat
What size members are used in lightweight trusses?
2X4
Which location in the building is best to locate the
trench cut?
Narrowest
What size hole is generally desired when venting the roof?
8X8 foot
Which of the following is NOT part of mechanical
ventilation?
Opening the roof
What force is acting upon the top chord of a truss?
Compressive
Which direction will fire travel the quickest in?
Low to high points
What does venting for fire wait upon?
Resources in place for attack
What is the most efficient distance to stand from the
opening when using a fog stream to ventilate an area?
6 to 8 feet
What is probably the greatest danger to firefighters who
are participating in roof ventilation?
Other firefighters
What is a common concern with all parallel chord trusses
during ventilation operations?
Cutting the top chord
Which of the following would heat to its failure point the
fastest?
1/8-inch thick angle iron
What should be done when a larger opening is needed in the
old-style flat-roof?
Extend the existing opening
How long after exposure to significant fire does the metal
deck roof fail?
5 minutes
What shape is the building with an inverted roof?
H
How many men should be assigned to the rooftop of a
building with an old-style flat roof?
4
How many times the height of the wall should the collapse
zone be when dealing with a building with a bowstring
truss roof?
2
What was positive pressure ventilation originally tested
to reduce?
Stack effect
How many main reasons are there for performing
ventilation?
2
What place in the multi-winged apartment building is the
best place to attempt to cut off the fire?
Throat
How long can it take for a lightweight truss ceiling to
fail?
Less than 10 minutes
Which type of roof has its main roof supports at the roof
level?
Standard flat
Which type of ventilation is best to perform at a mattress
fire?
Horizontal
What is the natural path of the heated gases during a
fire?
Upward
