Table 3:
Noise doses and eight-hour time weighted averages from the “I” exhaust configuration with all fans set to high speed.
| Exposure Time (hr) at 69.6 dBA* | OSHA† | NIOSH / ACGIH ‡ | ||
|---|---|---|---|---|
| Dose (%) | TWA (dBA) | Dose (%) | TWA (dBA) | |
| 1 | 0.7 | 54.6 | 0.4 | 60.6 |
| 2 | 1.5 | 59.6 | 0.7 | 63.6 |
| 3 | 2.2 | 62.5 | 1.1 | 65.4 |
| 4 | 3.0 | 64.6 | 1.4 | 66.6 |
| 5 | 3.7 | 66.2 | 1.8 | 67.6 |
| 6 | 4.4 | 67.5 | 2.1 | 68.4 |
| 7 | 5.2 | 68.6 | 2.5 | 69.0 |
| 8 | 5.9 | 69.6 | 2.8 | 69.6 |
*:
Sound level is that of the “I” configuration with all fans on high speed
†:
Criterion time = 8 hr; Criterion level = 90 dB; Exchange rate = 5 dB
‡:
Criterion time = 8 hr; Criterion level = 85 dB; Exchange rate = 3 dB