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Technical Information
Vent Capacity Table
Extraction volume expressed as cubic metres per second.
1 cubic metre = 1000 litres
|
Stack Height Metres |
Wind Speed Km/hr |
Temp Diff °C |
Model AA |
|
500 |
600 |
800 |
|
3.0 |
6 |
6 |
0.350 |
0.609 |
0.952 |
|
12 |
0.362 |
0.630 |
0.985 |
|
18 |
0.382 |
0.664 |
1.038 |
|
8 |
6 |
0.419 |
0.727 |
1.137 |
|
12 |
0.428 |
0.738 |
1.154 |
|
18 |
0.452 |
0.785 |
1.228 |
|
12 |
6 |
0.625 |
1.088 |
1.700 |
|
12 |
0.635 |
1.105 |
1.729 |
|
18 |
0.641 |
1.116 |
1.736 |
|
16 |
6 |
0.772 |
1.343 |
2.099 |
|
12 |
0.791 |
1.377 |
2.153 |
|
18 |
0.808 |
1.408 |
2.197 |
|
6.0 |
6 |
6 |
0.362 |
0.630 |
0.985 |
|
12 |
0.420 |
0.732 |
1.145 |
|
18 |
0.431 |
0.751 |
1.175 |
|
8 |
6 |
0.424 |
0.738 |
1.154 |
|
12 |
0.439 |
0.763 |
1.194 |
|
18 |
0.458 |
0.797 |
1.246 |
|
12 |
6 |
0.635 |
1.105 |
1.729 |
|
12 |
0.655 |
1.141 |
1.784 |
|
18 |
0.713 |
1.239 |
1.937 |
|
16 |
6 |
0.791 |
1.377 |
2.153 |
|
12 |
0.813 |
1.414 |
2.211 |
|
18 |
0.844 |
1.467 |
2.294 |
|
9.0 |
6 |
6 |
0.381 |
0.664 |
1.038 |
|
12 |
0.431 |
0.751 |
1.175 |
|
18 |
0.483 |
0.839 |
1.312 |
|
8 |
6 |
0.452 |
0.785 |
1.228 |
|
12 |
0.458 |
0.797 |
1.246 |
|
18 |
0.530 |
0.922 |
1.441 |
|
12 |
6 |
0.642 |
1.116 |
1.745 |
|
12 |
0.712 |
1.239 |
1.937 |
|
18 |
0.737 |
1.283 |
2.007 |
|
16 |
6 |
0.808 |
1.408 |
2.197 |
|
12 |
0.843 |
1.467 |
2.294 |
|
18 |
0.855 |
1.486 |
2.324 |
How to Calculate the Number of Vents
 1. Determine the volume of the building.
-
Volume of section A = 0.5 x L x W x Ha
-
Volume of section B = L x W x Hb
-
Total building volume = volume of section A + volume of section B
NOTE: For factories, the combined volume A + B should be used.
Where Volume B is air-conditioned, only Volume A is used to calculate the number of ventilators required. No air should be drawn from the air-conditioned space below ceiling level.
Using ventilators in the ceiling space of air-conditioned buildings reduces the load on the air-conditioning plant and helps reduce power consumption.
2. Select the number of ventilators required:
Consideration should be given to the space occupied by stored goods or machinery. The adjustment to volume can reduce the number of vents required by up to 50%. | 
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