Acoustic noise levels in decibel(A), with use of no hood, the 3T hood, and the newly developed 7T hood
| Both Ends of the Bore | Sides of the Bore | Sides and Ends of the Bore | |
|---|---|---|---|
| No hood for acoustic noise protection | 60.0 dB(A) | 58.5 dB(A) | 62.5 dB(A) |
| 3T Nordell hood for acoustic noise protection | 54.0 dB(A) | 51.0 dB(A) | 55.5 dB(A) |
| Prototype 7T hood for acoustic noise protection | 54.0 dB(A) | 43.0 dB(A) | 54.0 dB(A) |