The Number of CEAV to be installed depends on many factors like air changes per hour and volume of air to be exhausted in each department of plant etc.
Air Ventilator, A conceptual product which exhausts the hot gases from an enclosed area without using any electric power, as it is operated by natural air blow.
CALCULATIONS FOR NUMBER OF AIR VENTILATORS TO BE INSTALLED:
| No. of Air ventilators = |
| Volume of air to be exhausted in plant (Cubic Ft.) X Air changes per hour |
| Capacity of one air ventilator at x height (CFM) X 60 |
|
|
Here,
Volume(in cubic Ft) = L x B x H
Volume of air to be exhausted = Volume of Plant or department.(L x B x H)
Capacity of one air ventilator at X height,
|
| Capacity in CFM |
Height in Ft. |
| 1500 |
10 |
| 1700 |
20 |
| 2000 |
30 |
| 2400 |
40 |
| 3000 |
50 |
| 3700 |
60 |
|
Air changes per hour from Standard table.
| Types of Building |
Air changes per hour |
| Auditorium |
4-12 |
| Assembly Hall |
6-12 |
| Boiler Room |
15-60 |
| Bakeries |
12-20 |
| Conference rooms |
8-12 |
| Commercial kitchens |
10-20 |
| Dye works |
10-15 |
| Engine Room |
12-30 |
| Electroplating shops |
10-20 |
| Foundry |
10-25 |
| Hospital sterilizing wards |
4-6 |
| Laundry |
12-30 |
|
|
| Types of Building |
Air changes per hour |
| Laboratories |
8-12 |
| Light Factory |
6-12 |
| Heavy Factory |
10-30 |
| Paper Mill |
8-30 |
| Painting Shop |
10-30 |
| Packing Room |
8-30 |
| Restaurants |
6-10 |
| School rooms |
2-4 |
| Textile Mill |
4-12 |
| Transformer Room |
12-30 |
| Stores & Ware house |
4-6 |
| Welding shops |
10-25 |
|
