Fire ventilation

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Temperature/Rate of heat releaseThe initial stageof the fireFlashoverThe fully developedfireThe cooling phaseTimetherefore neither will they influence the intensity of the fire.In the initial stage of a fire the fire is normally fuel controlled,while the fully developed fire is normally ventilationcontrolled. The flashover is therefore the transitionstage from fuel control to ventilation control. What canoften happen during fire ventilation is that the conditionschange from ventilation control to fuel control, or from astage with powerful ventilation control to a stage with notso fully developed ventilation control.The temperature anddevelopment of theintensity during acomplete fire scenario.21
Page 1 and 2: To carry out fire and rescue operat
Page 3 and 4: The content of this book may not be
Page 5 and 6: Inlets 51Horizontal fire ventilatio
Page 7 and 8: ForewordIn this book fire ventilati
Page 10 and 11: chapter 1Fire ventilationThe fundam
Page 12 and 13: Openings to gain access to a fire t
Page 14 and 15: would be the case, for example, in
Page 16: esults in quicker and more simple e
Page 19 and 20: PyrolysisIrreversible chemicaldecom
Page 21: Flashover results in afully develop
Page 25 and 26: ReactivitySubstances have different
Page 28 and 29: chapter 4The spread offire gasesThe
Page 30 and 31: The hydrodynamic pressure, i.e. the
Page 32 and 33: ΔP uρ, T a ahuv gPressure inbuild
Page 34 and 35: or, expressed in terms of temperatu
Page 36 and 37: side). The negative pressure on the
Page 38 and 39: tely different direction. Very comp
Page 40 and 41: from cooking and bad/old air etc.)
Page 42 and 43: air and therefore rises upwards, wh
Page 44 and 45: Pressure differences created by the
Page 48 and 49: chapter 5Working withfire ventilati
Page 50 and 51: The requisite size of outlets is de
Page 52 and 53: Outlets should be placed where the
Page 54 and 55: The pressure drop over the outlet i
Page 56 and 57: avAv10,90,80,70,60,50,40,30,20,1150
Page 58 and 59: Basement fires can often cause a pr
Page 60 and 61: tion: for example, when implementin
Page 62 and 63: Fire ventilation canbe implemented
Page 64 and 65: increases the risk of explosion. Wh
Page 66 and 67: Positive pressureventilation is bas
Page 68 and 69: This has, however, proved to only h
Page 70 and 71: The relationship between the size o
Page 72 and 73:
With the help of the equations 1—
Page 74:
A fog nozzle can be usedfor fire ve
Page 77 and 78:
Openingsin tin plated roofs.Alwayso
Page 79 and 80:
1 23 45 61. Electric cuttingmachine
Page 81 and 82:
Iron bar, pincers,jimmy, crowbar.Fi
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chapter 7Safety when workingat high
Page 86:
obvious reasons. It is mainly a que
Page 89 and 90:
persons should be available for thi
Page 91 and 92:
Tiled roofsThe tiled roof is built
Page 93 and 94:
Roofs with corrugated metal sheetin
Page 95 and 96:
Permanent installations for fire ve
Page 97 and 98:
Examples of differentsystems for co
Page 100 and 101:
chapter 9TacticsTactics can be said
Page 102 and 103:
mented create, together with the ac
Page 104 and 105:
103
Page 106 and 107:
chapter 10Examples of firefighting
Page 108 and 109:
To be taken into consideration in t
Page 110 and 111:
in intensity. At some point flashov
Page 112 and 113:
Ventilation-controlled fi reIn the
Page 114 and 115:
Stairwells with hot gasesDuring apa
Page 116 and 117:
The stairwell is full ofcold smoke,
Page 118 and 119:
Lund Institute of Technology, The I
Page 120 and 121:
List of figuresDrawn illustrations:
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Fire ventilation

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