Book 29 Flashcards
Effective ventilation will accomplish four main objectives?
- Save lives.
- Assist in firefighter access.
- Control the horizontal spread of fire.
- Reduce the possibility of flashover and backdraft.
Ventilation will also reduce the chance of _______ burns to firefighters from their hose stream.
Steam
On an average, __/100 of those deaths are due to flashover?
85
With horizontal ventilation, there are two methods usually performed, which are?
natural and positive pressure ventilation
The key to safe and effective roof ventilation is the knowledge of?
rafter type and rafter direction
if time and safety permits, the roof team “____” cut the heat hole directly over the fire.
Will
On roofs sheathed with plywood, the “Head Cut” is made?
perpendicular to rafters
There are basically only TWO (2) types of ventilation holes?
Heat Hole (Offensive) Strip Ventilation (Defensive)
A ____ cut is a single cut made through the roof decking, the same width as the chain saw blade
Kerf
For roof ventilation, a “MINIMUM” of ____ ladders should be thrown to the involved structure.
2
Once all 4 cuts are complete, use a rubbish hook and push down on the ______ (the side closest to your ladder) and pull on the ______. This method is used with the center rafter louver technique.
near side
far side
A ____ cut is a small triangular piece of roof covering (composition), which is removed from the roof to expose the roof sheathing
Plug
A plug cut is used to determine sheathing type and roof composition thickness.
A _____ cut is a light cut of the roof covering, usually composition only. A ____ cut is used to facilitate the removal of multiple layers of roofing material (composition).
score for both
A ____ cut is a light cut made with the chain saw, cutting through the roof covering and plywood sheathing. The saw is not inserted deep enough to cut through the rafters.
Skim
Skylights are usually constructed from glass or plastic. On apartment buildings, skylights will be placed over _______ and _______. On commercial buildings, they will be placed over _________?
hallways and stairwells
manufacturing areas
