The required air volume depends on the room usage,created contamination and heat in the room.While choose the ventilation fan,should consider min air volume per person needed and the air exchange frequency.
Ventilation Selection Calculation
Required products quantity will be calculated as below:
Required product Qty=Required air flow volume(m³/h)÷Air flow volume of selected product(m³/h)
Two methods to calculate the required airflow volume(m³/h):
1. Calculated by the times of required air exchange per hour
V=RV*N
Rv:room volume(m³)
N:times of air exchange per hour(t/h)
2.Calculated by required airflow volume to each person
V=PV*P
PV:volume of needed air to each person person (m³/h)
P: number of person
The Choice of Air Exchange Rate:
| Places | Air Exchange Rate(t/h) | m³/per person |
| Libraries | 10~20 | 30 |
| Paint room | 10~20 | 30 |
| School classroom | 3~8 | 30 |
| Gymnasiums | 4~6 | 30 |
| Auditoriums | 6~8 | 30 |
| Cinemas | 5~8 | 30 |
| Laboratories | 8~15 | 30 |
| Storeroom | 1~3 | 30 |
| Garage | 4~8 | 30 |
| Cellar | 4~6 | 30 |
| Bathroom | 7~9 | 30 |
| Living room | 3~6 | 30 |
| Warehouse | 1~2 | 30 |
| Kitchen | 10~15 | 30 |
| Office | 5~7 | 30 |
| Retail shops | 4~8 | 20 |
| Restaurant | 8~10 | 20 |
| Supermarket | 2~3 | 30 |
| Smoking room | 8~10 | 50 |
| Laundary room | 10~13 | 30 |
| Bank | 2~4 | 40 |
| TV Bar | 9~11 | 50 |