English 29
NOISE REDUCTION RATING (NRR)
PRO-COMMS ELECTRONIC HEARING PROTECTION
The level of noise entering a person’s ear when a hearing protector is worn as directed is closely approximated
by the difference between the A-weighted environmental noise level and the NRR.
EXAMPLE
1. The environmental noise level as measured at the ear is 92 decibels dB(A).
2. The NRR is 26 dB(A).
3. The level of noise entering the ear is approximately 66 dB(A).
TEST FREQUENCIES(HZ) 125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA Class
Mean Attenuation (dB) 19.6 23.3 30.8 36.8 35.9 42.7 43.5 43.2 43.7
26 A
Standard Deviation 2.8 2.7 3.2 2.7 2.8 3.4 2.9 3.1 2.7
ATTENUATION DATA | 3M PRO-COMMS WITH GEL SEALING RINGS ANSI S3.19-1974
MODEL 90546-SIOC
26
The EPA references to Federal relate to US Federal laws.
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