3M PRO-PROTECT Manual Del Usuario página 28

NOISE REDUCTION RATING (NRR)
PRO-PROTECT HEARING PROTECTION
26
Model 90545-SIOC
The EPA references to Federal relate to US Federal laws.
ATTENUATION DATA | 3M PRO-PROTECT WITH GEL SEALING RINGS ON HARD HAT
TEST FREQUENCIES (HZ)
Mean Attenuation (dB)
Standard Deviation
28 English
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA Class
16.7 21.2 30.4 36.8
2.3 2.0 3.0 2.1
31.7 37.9 39.6 40.0
2.6 3.0 3.6 4.4
ANSI S3.19-1974
38.8
26 B
3.2