Vertical Vent Flashcards
Horizontal ventilation will also facilitate the initial attack crew in making a “__” on the fire
push
A diagnostic cut used to determine the type, direction, and spacing of rafters as well as the sheathing type and thickness of roof covering.
Inspection hole
A small triangular hole cut through the roof decking (sheathing and roof covering material) made with the chain saw or an axe. They are used to indicate smoke and fire conditions directly below the opening.
Smoke indicator hole
A hole placed directly over the fire, or as close to the fire as safety
allows, venting the products of combustion to the atmosphere. A Heat Hole is
generally placed at the highest point possible to vent convected smoke, heat and
gases.
heat hole
A defensive ventilation opening created by removing a long narrow
section of roofing material well ahead of the fire. A trench cut is usually
performed across the width of the roof, from parapet to parapet, in coordination
with a heat hole.
trench cut
Any pre-existing opening in a roof such as a skylight, scuttle
hole or roof vent.
natural openings
A small, covered opening that provides access to the roof from the
interior of a building. When used for ventilation purposes, scuttles must be
evaluated to ensure they access the space intended for ventilation (attic or public
hallway).
roof scuttle
A structure on the roof which allows light to travel to the interior of
the building. Skylights are usually constructed from glass or clear plastic. On
apartment buildings, skylights will be placed over hallways and stairwells, while
on commercial buildings, they may be placed over manufacturing areas.
skylight
The direction that is upwind from the intended ventilation point (door,
window, or the selected location for a roof ventilation hole).
windward
The direction that is downwind from the intended ventilation point
(door, window, or the selected location for a roof ventilation hole).
leeward
Roofs built with conventional construction components typically withstand fire for ____
greater length of time than lightweight truss construction
a much
When conducting ventilation operations on conventionally constructed roofs, if fire conditions permit, the heat hole should be cut____.
directly over the fire
When exposed to fire, roofs built with lightweight truss
construction can fail ____, resulting in a significantly
diminished time frame for the roof team to conduct roof operations.
relatively quickly
When conducting ventilation operations on lightweight
constructed buildings, ventilation teams ____conduct
operations directly over the fire.
shall not
When using skylights for roof ventilation, it is imperative that firefighters remove them in a ____ manner.
systematic
Skylights that have been removed or covered over can usually be identified by a slightly ____ of roofing material.
elevated rectangular or square section
When conducting vertical ventilation operations firefighters must
employ the practice of
“trading space for time”
A heat hole will also reduce the horizontal spread of fire as well as the potential for ____
flashover or backdraft
On commercial structures a good starting point hole size is a 4’x 8’ hole
4’x 8’ hole
A heat hole should be completed or the fire should be naturally ventilated
prior to initiating a ____operation
trench cut
A trench should be completely cut from ____before any panels are pulled.
one end of the roof to the other
An initial trench width of ____ can be sufficient to serve as a fire
stop with hose lines in place.
24-48 inches
Care must be taken to avoid “____” the roof crew’s means of
escape.
trenching off
When implementing a defensive strategy with a trench cut operation,
companies must be assigned and in place with ______
hose lines on the roof
The trench itself will not ____ the fire; it is only expected to slow the spread temporarily while the hose lines extinguish it.
extinguish
When a structure has a flat roof, ladders should be placed at ____of the building unaffected by fire.
corners
Peaked roof ops A roof crew must establish a second means of egress off of the roof
as ____
soon as possible
Most flat or arched roofs will require a ___ at a minimum and will often require multiple crews working together
full four-person truck crew
Vertical ventilation should not be performed on small fires where
____ ventilation already exists
adequate
A residential roof should not be cut after____
a fire is knocked down or
extinguished
Lightweight roofs can fail within___minutes of structural fire
impingement.
five
