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| Figure 1: An example of the ventilation calculation | |
| Pub when full holds 120 people | |
| Minimum fresh air requirement (FAR) per person = | 28·8 m3/hr |
| Therefore: 120 x FAR (28·8 m3/hr) = | 3456 m3/hr |
| Calculation for 9" fans | |
| Typical 9" fan delivers | 900 m3/hr |
| Therefore: 3456/900 = | 3·84 |
| Fans required = | 4 |
| Calculation for 12" fans | |
| Typical 12" fan delivers | 1500 m3/hr |
| 3456/1500 = | 2·304 |
| Fans required = | 3 |