Mittendorf Flashcards
fire gas ignite temp
800-900 degrees
BTU release for wood/polyurethane/polystyrene
wood-7000
p-urethane- 12000
p-styrene- 18000
flashover is more common due to
lower ignition temp of plastics and interior items
flashover FF death %
85
signs of backdraft
heavy, dark, pressurized smoke
doors/windows hot to the touch
flashover defined
sudden ignition of exposed combust sufaces or gases in an involved area
flashover (opposed to backdraft) lacks
sudden O2 introduced
confinement
heated flammable gases under pressure
primary gas for fatalities
CO
O2 % and CO PPM following flashover
O2 21%—>4%
CO- 40,000 PPM
single family dwelling considerations
time of day
heat hole over fire near ridge beam
Multistory dwelling priority
improving atmosphere in stairwells and hallways
ladders on ________ward side
wind
Center hallway (old construction) characteristics
allows more rooms
3+ story buildings have fire doors
fire doors separate stairwells and hallways
skylights over top hallway
center hallway ventilation
start low and work up
center hallway vertical vent priorities
stair shaft
skylights
over fire room
Garden Style apartments
common attic
low pitch roof
2x6 rafters
Institutional fires
church/school/hospital
common in kitchen, lounge, or storage
Commercial buildings
common attic
fascia considered common attic
warehouse fire characteristics
easy fire spread
size of electrical service
what is made?
704 placard?
primary concern in high rise fire
spread to upper floors
elevators can be used in high rise if…
terminates 5 floors below
walls that penetrate attic
division wall/or partition wall
division wall
Parallel blowers for
covering a larger opening
blowers in series for….
increasing volume (10%)
systematic ventilation
near to far
low to high
exhaust opening
0.75-2.0 times the PPV intake
PPV works against up to _______mph wind
25
PPV effective in excess of __________ft
1000
2 categories of stair shafts
interior access, interior shaft, open to roof
exterior access, interior shaft, open to roof (better airflow)
gas blower introduces how much CO PPM
140-160
Ventilation Size Up
building age/type location/extent of fire roof characteristics ladders hazards
screens restrict flow by….
50%
turbine vents ______% more efficient with top in place
30
heat hole size guideline
residential-4x4
commercial-8x8
depth of rotary saw cut
3.5-5
chain saw can cut ______gauge steel
14
gas blower______% more efficient than electric
40
