PREFERRED NOISE CRITERIA

PNC-55

PNC-50

PNC-45

PNC-40

PNC-35

PNC-30

PNC-25

PNC-20

PNC-15

NOISE RATING

NR-55

NR-50

NR-45

NR-40

NR-35

NR-30

NR-25

NR-20

NR-15

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