Ventilation Flashcards
4 phases of a room fire (fire ventilation book)
Initial stage
Flashover
Fully developed
Cooling phase
What is the transition stage from fuel control to ventilation control?
Flashover
Five aspects to consider when it comes to properties of fire gases
Low or no transperancy
Can be combustible
Toxic
Reactive
Hot
What can create a large part of infared radiation?
Water vapor
Flammability range of CO at room temp
12.5-74 percent (brannigans)
11-74 percent (ventilation)
At buildings with openings at both the top and the bottom, the ____ effect will occur
Stack effect
In tall buildings with staircases the ____ effect may be the dominant cause of the spread of fire gases
Stack effect
What are the main driving forces for the creation of a hot upper layer of fire gases (fire gases flowing out of fire room and into other rooms)
Thermal buoyancy (differences in density)
Flow path and ____ are basically the same thing
Fire ventilation
What are WATTS?
JOULES per second w=j/s
Inlet openings should be preferably up to ____ as large as exhaust openings
Twice as large
The inlet openings should be ____ than the exhaust openings
Larger
Low openings on windward and high openings on ____ side should be used for horizontal ventilation
Leeward
Structural fire can be defined as a fire in hidden ____ or ___ with limited access
Hidden spaces or surfaces
An exhaust opening should be ____-___ meters squared
1-4 meters squared
