Frag Out! Magazine
Issue link: https://fragout.uberflip.com/i/693549
It is a simplified rating of noise reduction – rating used in the European Union countries and its neighboring countries. It deter- mines in a number an attenuation level which should be ensured by a hearing protector. The SNR presents rating of protectors considering the noise spec- trum of the environment in which the protector is to be worn: H – for high frequencies, M – for medium frequencies, L – for low frequencies. Note! The H, M, L values do not refer to a sound level, but to an acoustic spectrum of sound. For example, a protector marked by SNR 26, H=32, M=23, L=14 – an estimated attenuation band changes together with a noise acoustic spectrum in the environment in which a protector is worn. The SNR is a result of the mathematical calculations and gives a single attenuation rating of the respective protector for the highest percentage of the population. SNR – Single Number Rating NRR – Noise Reduction Rating Noise Reduction Rating used in the United States of America and accepted by the European Union countries. It means an approximate level of noise reduction obtained due to a protector, expressed in dB. A current range of the NRR in the United States is from 0 to 33 dB. This rating was introduced to use in the United Stated by the U.S. Environmental Protection Agency (EPA) in 1979 and now it is marked on all products for he- aring protection in the United States. The Noise Reduction Rating indicates an average value of attenuation and a standard mean devia- tion on each of seven frequencies (from 125 Hz to 8000 Hz). Shooting, folding protectors Peltor Industrial hearing protection Peltor PPE