Ch 4 Flashcards
Approximately what amount of time is there in the modern environment before the fire conditions explode when air is introduced without water application?
p. 107
2 minutes
What is one of the last signs before flashover occurs?
Rollover
During which stage of the fire does a fire plume begin to form above the ignited material?
Growth
What is the best indicator of something going bad inside the fire building?
Smoke pressure
During which stage will all of the combustibles in the room be in flames after a flashover occurs?
Fully developed
What was the public evacuation time according to NIST in 1970?
17 minutes
What is the most reliable interior clue to impending flashover?
Heat buildup
What is the public evacuation time today according to NIST?
3 minutes
What stage will the fire resume (more violently) when oxygen is introduced during the decay stage?
Growth
What is the actual ignition of the atmosphere?
Flashover
What size fog should be used to cool the interior of a fire building to prevent flashover?
30°
What is the approximate ignition temperature of carbon monoxide?
1200°F
What is the approximate flashover development time for the modern environment?
5 minutes
Above what moisture level will ignition of wood become more difficult?
15%
What is the most important factor in regard to exposure protection with radiant heat?
Distance
Where does the vent-point ignition usually occur?
Near the top of the door
What is the approximate flashover development time for the legacy environment?
p. 102
A.) 25 minutes
B.) 35 minutes
C.) 20 minutes
D.) 30 minutes
30 minutes
What will fire spread characteristics depend upon to a
great degree?
p. 97
Structural traits of the building
Approximately what amount of time is there in the modern environment before the fire conditions explode when air is introduced without water application?
p. 107
2 minutes
In this phase, a fire plume begins to form above the ignited material. Rising gases begin to spread upward. At the ceiling, these gases begin to spread laterally and bank down, radiating heat to other items in the area.
Growth phase
During the growth stage, the walls and ceiling reach a point of heat saturation and will begin to reradiate heat back into the room. This reradiated heat is called __________and, if not controlled promptly, it will be largely responsible for development of_______ conditions. P98
thermal radioactive feedback
flashover (TQ)
