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Engineering Tips
Number of Natural Roof Ventilator by Area Calculations1. Area Calculatios
| Formula : (Put Building Dimension) |
Width | X | Length | X | Height |
| 90 | x | 120 | x | 5 | |
| Building Volume= | 54,000.00 M3 (CU.M) | ||||
1. Airchange Calculation
Choose airchange / hr. classified by the utilization.
| Utilization (Installation Area) | AIRCHANGE/HR. |
| Warehouse | 5-7.5 |
| Worker Area / Factory | 10-15 |
| Machine Area / Manufacture | 15-25 |
| Kitchen (High temperature Room) | 25 or more |
| Spraypaint Chamber / Pollution Room | 30-100 |
| Formula | Building Volume | X | AIRCHANGE /HR. | X | 60 minute |
| 54,000.00 | x | 25 | + | 5 | |
| Total Airchange Volume = | 522,500.00 CMM.(cu.metre/mt) | ||||
1. Number of Natural Roof Ventilator Calculation
Capacity of Natural Roof Ventilators for each model for an average wind Velocity 6miles/hour
| Dia-14” | = 33 CMM. |
| Dia-18” | = 43 CMM. |
| Dia-22” | = 80 CMM. |
| Dia-25” | = 90 CMM. |
| Dia-30” | = 111 CMM. |
| Dia-39” | = 162 CMM. |
| Total Air change Volume | + | Capacity of each model. | = | Total Number for Installation |
| 22,500.00 | + | 80.00 | = | 282.00 Sets |
Remark : Example is for installation of ventilator in manufacture or machine area.
