Ventilation Techniques (ch.1) Flashcards
Ventilation is the ______
Systematic removal of heat, smoke, and fire gases from a structure, replacing it with cooler clean fresh air.
Effective ventilation will accomplish four main objectives
- save lives
- Assist with firefighter access
- control the horizontal spread of fire
- reduce the possibility of flashover and backdraft
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
Condition where all of the contents of a room are heated to their ignition temperature.
Flashover
Each year in the United States, there is an average of ____ deaths to firefighters in fire service. _____ of those deaths are due to flashover
100 deaths in fire service
85 deaths to flashover
With horizontal ventilation there are two methods usually performed
Natural and positive pressure ventilation
The key to safe and effective roof ventilation is the knowledge of ____ and ___
Rafter type and direction
There are basically only two types of ventilation holes:
- Heat Hole (Offensive)
2 Strip. Ventilation (defensive)
Strip ventilation must be done in conjunction with a ____
Heat hole
Center rafter cut is a technique when cutting ___ sheathing (4cuts)
Plywood
Decking is the material used to comprise the ____ and exterior covering.
Base
Diaphragm nailing; plywood sheathing is installed so that ____ ‘ dimension crosses the rafters and the ____ ‘ dimension
8’ crosses
4’ parallel
For diaphragm nailing
Dicing is a technique used to cut _____” or ____in solid, spaced or diagonally sheathed roofs.
1x4 or 1x6 sheathing
Metal clips used to hold the butted ends of plywood together
H clips
A head cut is a cut made through the roof decking that is made perpendicular to rafters. A head cut is used to _____
Locate rafters
The removal of sheathing is enhanced by a _____ motion
J hook