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WHY PRESSURISATION
 
Objective Of Smoke Control
The objective of smoke control system is to keep the smoke and toxic gases out of escapes routes.AN adequate smoke control system will help the fire ffighters deal both with the fire and any residue smoke
 
Smoke Ventilations

In large open spaced buildings,car parks,shopping centers,exhibitions halls etc. usual method of smoke control is by ventilation ,extracting the smoke from areas.

 
Pressurations
It is possible to hold back smoke by simply supplying clean air into the escape routes,thereby developing excess or positive pressure in the spaces requirinng protection.
 
Air Requirements

Having established the pressure level required to hold back the smoke ,the air volume to be supplied to escape route to develop this pressure can be calculated by the formula

Q=0.827*Ae*P**(1/n)
Q=the volume of air required (m3/sec)
Ae=Leakage area from space (m2)
P=Pressure differantial (Pa)
n=Leakage factor
n ; for large leakage areas doors n=2 for small leakage areas windows cracks n=1.6
 
Type of Door
Size
Crack Length
Leakage Area
m*m
m
m2
Single leaf in frame opening into pressurised space
2m*0.8m
5.6 m
0.01
       
Single leaf in frame opening into outwards
2m*0.8m
5.6 m
0.02
       
Double leaf with or without central rebate
2m*1.6 m
9.2 m
0.03
       
Lift Door
2m*2 m
8.0
0.06
 
 
 
 

 

 
 
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