Optimum volume per person for various types of hall
| Type of Hall | Optimum Volume /person (m3) |
| concert halls | 7.1 |
| Italian-type opera houses | 4.2 - 5.2 |
| churches | 7.1 - 9.9 |
| cinemas | 3.1 |
| Rooms for speech | 2.8 |
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