VENTILLATION ----FAN REQUIREMENT

Calculation for EXTRACT FANS:
FANS ARE PROVIDED TO EXTRACT AIR FROM INSIDE THE ROOM AND THROWN OUT SIDE. USUALLY FANS ARE NOT PROVIDED FOR FRESH AIR SUPPLY TO THE ROOM. SUCTION POINTS ARE KEPT OPEN JUST OPPOSITE THE EXTRACTION FAN ON THE OPPOSITE WALL BUT FRESH AIR FANS CAN BE PROVIDED TO SUPPLY COOL AIR TO THE HOT POINT OF THE MACHINARY IF REQUIRED TO COOL OFF THE MACHINE.
SITUATION
AIR CHANGE PER HOUR
Volume OF ROOM (Cu Mtr)
AIR CHANGE TAKEN
AIR MOVEMENT (cu mtr/Hr)
Model Of Fan
Number of FANS
Factory/workshop/cinema/hospital/canteen/restaurant
6-10
30x20x8=4800
10
10x4800=48,000
GPN45043,18 inch dia,372 watt,7000 cu mtr/hr
7 nos
Boiler houses/kitchen/dark rooms/
15-30
20x15x10=3000
30
30x3000=90000
BVN61063,24 inches,500watt,10450 cu mtr/hr
9 nos
Foundries
30-60
30x10x8=2400
50
50x2400=120000
BVN61063
12 Nos
Laboratory/office/bank/assembly hall
4-6
10x8x4=320
6
6x320=1920
GPN30061,12 inch,1200 cu mtr/hr
2 Nos
CAPACITY OF EXTRACT FANS (ALSTOM INDUSTRIAL FAN)
DIA (INCHES)
SPEED(RPM)
INPUT(WATT)
FREE AIR FLOW(cu mtr/Hr)
COST(Rs.)
12
900
50
1200
12
1400
80
2000
15
900
85
2500
15
1400
180
4200
18
900
132
4500
18
1400
372
7000
24
900
500
10450
24
700
240
7900
36
700
1200
28000
36
550
700
22100