*Bk 29- Ventilation Flashcards
If the heat, smoke, and fire gases are not released, they will accumulate at the highest point of the structure and begin to bank down and spread laterally. This process is generally known as?
Mushrooming
________ is a condition where all of the contents of a room are heated to their ignition temperature. Once their ignition temperature is reached, the entire room will quickly be involved in flames.
Flashover
In a confined area, if the structure’s contents reach their ignition temperature and there is not sufficient oxygen to support combustion. Once oxygen is introduced, _________ can occur.
Backdraft
The best way to prevent backdraft is to perform ____________
Vertical ventilation
What are the two types of horizontal ventilation that can be performed?
Natural and positive pressure
With conventional construction, if time and safety permits, the roof team “WILL” cut the heat hole where?
Directly over the fire
When operating on a lightweight truss roof (or suspected
lightweight truss), the ventilation team _______________ conduct ventilation operations directly over the fire
Shall not
The two types of ventilation holes are:
- Heat hole (offensive)
1. Strip ventilation (defensive)
What type of hole is placed directly over the fire or as close to the fire as safety will allow?
Heat hole
What type of hole should be placed well ahead of the fire, and should extend the entire width of the building, creating a firebreak?
Strip ventilation hole
Before cutting a strip hole, what must be accomplished first?
Heat hole
What type of cut is a technique used when cutting plywood sheathing (4 cuts)?
Center rafter cut
_________ is the material used to comprise the base and exterior covering for a roof.
The base is the material attached to the roof rafters
Decking
When sheets of plywood are then staggered much like a brick or block wall, this is known as?
Diaphragm nailing
Plywood sheathing is installed so that the ________ ft dimension of the plywood crosses the rafters or joists and the _______ ft dimension parallels the rafters or joists
- 8
2. 4
What technique is used to cut 1” x 4” or 1” x 6” solid, spaced, or diagonally sheathed roofs?
The cuts are made _______ to rafters with no concern to locating rafters.
- Dice cut
2. Parallel
What type of metal clips are used to hold the butted ends of plywood together?
They are common on ______ roofs.
- H clips
2. Pitched
What type of cut is made through the roof decking that is perpendicular to rafters and used to locate rafters?
Head cut
A head cut must be done on roofs covered with _______ and _______ sheathing
- Plywood
2. Diagonal
The removal of sheathing is enhanced by a _______ motion with an appropriate tool.
It is more effective when used near the rafters.
J hook