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Table 2: 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)