Noise attenuation
Reinforced attenuation on high frequencies (the most risky) and 2 levels of attenuation (high or very high) thanks to the closing flap:
- low protection in quiet (4dB to 80dB of noise).
- moderate attenuation in medium noise (24dB to 100dB).
- high attenuation in high noise (39dB to 120 dB).
Product details by manufacturer
MK 4 plugs comply with CE standards for PPE in accordance with directive EN 352-2 - 2002.
Attenuation values tested in accordance with standard EN 352-2 : 2002 of directive 89/686/ECC (These values give the attenuation level at a constant incoming noise level):
ALVIS Mk4 closed SNR : 27 H : 28 M : 24 L : 24.
ALVIS Mk4 Open SNR : 19 H : 22 M : 16 L : 11**.
2 positions
Open: the progressive filter attenuates noise according to its level. Faithful, natural hearing in quiet, protected in noise.
Closed: an occlusive, waterproof plug.
Size
Available in two sizes, M and L.