A) STANDARD EN 352-1:2020
3M strongly recommends personal t testing of hearing protectors. Research suggests that users may receive less noise
reduction than indicated by the attenuation label value(s) on the packaging due to variation in t, tting skill, and motivation
of the user. Refer to applicable regulations and guidance on how to adjust attenuation label value(s). In the absence of
applicable regulations, it is recommended that the attenuation label value(s) be reduced to better estimate typical
protection.
A:A Headband with foam cushion
MRX21A3WS6, MRX21A5WS6
A:1 f (Hz) A:5
125 250 500 1000 2000 4000 8000 H M L SNR
A:2 MV (dB) 13.8 19.3 30.4 34.5 37.7 39.5 36.2 37.4 29.4 20.8 31.6
411 gA:3 SD (dB) 2.7 2.4 2.7 3.6 2.3 2.7 4.1 2.3 2.1 2.2 2.0
A:4 APV = MV - SD (dB) 11.1 16.9 27.7 30.9 35.4 36.8 32.1 35 27 19 30
A:6: S, M, L
A:A Headband with gel cushion
MRX21A3WS6, MRX21A5WS6
A:1 f (Hz) A:5
125 250 500 1000 2000 4000 8000 H M L SNR
A:2 MV (dB) 12.6 19.6 30.4 32.4 40.1 40.5 38.0 37.9 28.8 20.1 31.2
473 gA:3 SD (dB) 2.9 2.0 3.0 2.8 3.3 3.3 2.8 1.9 1.5 2.1 1.6
A:4 APV = MV - SD (dB) 9.7 17.6 27.4 29.6 36.8 37.2 35.2 36 27 18 30
A:6: S, M, L
A) STANDARD EN352-3:2020
A:B Carrier attachment with foam cushion earmuff
MRX21P3E3WS6, MRX21P3E5WS6
A:1 f (Hz) A:5
125 250 500 1000 2000 4000 8000 H M L SNR
A:2 MV (dB) 14.2 19.7 29.6 33.4 36.3 39.5 34.6 36 29.2 21.1 31.2
431 gA:3 SD (dB) 3.9 1.9 2.5 1.8 2.5 2.7 4.9 2.3 1.5 2.7 1.7
A:4 APV = MV - SD (dB) 10.3 17.8 27.1 31.6 33.8 36.8 29.7 34 28 18 30
A:B Carrier attachment with gel cushion earmuff
MRX21P3E3WS6, MRX21P3E5WS6
A:1 f (Hz) A:5
125 250 500 1000 2000 4000 8000 H M L SNR
A:2 MV (dB) 11.8 18.6 28.4 33.2 37.9 39.1 36.9 36.9 28.1 19.3 30.4
495 gA:3 SD (dB) 2.3 2.0 2.0 2.7 2.4 3.2 4.1 2 1.3 1.8 1.4
A:4 APV = MV - SD (dB) 9.5 16.6 26.4 30.5 35.5 35.9 32.8 35 27 18 29
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