SMI Catalogue 2025/2026 - Flipbook - Page 249
SNR
You subtract the SNR value from the noise
you are measuring (average). For example
the level of noise is 90dB and the person
wearing Ear Plugs with an SNR of 32, then
the exposure level is: 90 3 27 = 63dB.
SNR
NOISE LEVEL
20 SNR OR LESS
85dB-90dB
20-30 SNR
90dB-95dB
25-35 SNR
95dB-100dB
30 SNR
100dB-105dB
PPE HEARING PROTECTION
SNR (Single Number Rating) is a system
which uses numbers to allow comparison on
the level of noise reduction provided by
hearing protectors.
NOISE LEVEL EXAMPLES
HAIR DRYER
80dB
CAR REVIVER
105dB
MUSIC CONCERT
110dB
CHAINSAW
120dB
ROAD BREAKER
140dB
FIGHTER JET ENGINE
200dB
SONIC BOOM
01428 658 333
90dB
HELLO@SMIGROUPUK.COM
TALKING
SMIGROUPUK.COM
60dB
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