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| Q. |
The number of air changes per hour recommended for auditoria is |
| A. | 3 to 6 |
| B. | 6 to 10 |
| C. | 10 to 12 |
| D. | 15 to 20 |
| E. | None of the above |
| Answer» A. 3 to 6 | |
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