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| Application |
Maximum air speed
in conducts (m/s) |
| Mansions, large halls |
2,5 to 3 |
| Dwellings, churches, offices |
2,5 to 4 |
| Hotel bedrooms |
2,5 to 4 |
| Theatres |
4 |
| Cinemas |
5 |
| Department stores |
6 to 10 |
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| Gas and steam only |
Characteristics of the source of contamination |
Example |
Capture speed Vc (m/s) |
| Discharge with almost null speeds and quiet air. |
Kitchens, tank evaporation, degreasing. |
0,25 - 0,5 |
| Discharge at low speed in quiet air. |
Welding, Stripping, Galvanotechnic workshops. |
0,5 - 1 |
| Active generation in areas of quick air movement. |
Paint cabins. |
1 - 2,5 |
| With particles in suspension |
Active generation in areas of quick air movement. |
Crushing machines |
1 - 2,5 |
| High speed discharge in areas with very quick air movement. |
Abrased, Ground |
2,5 - 10 |
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| Materials |
Minimum speed
for transport (m/s) |
| Seed dust |
9 |
| Jute dust |
10 |
| Flour |
13 |
| Sawdust |
15 |
| Metal dust from grinding |
15 |
| Wood shavings |
18 |
| Rubber dust |
20 |
| Brass shavings (fine) |
20 |
| Fine carbon particles |
21 |
| Find lead particles |
25 |
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