DUAL PROTECTION
MAXIMUM PROTECTION BUT WITH LIMITATIONS
EXAMPLE
33dB 29dB EARPLUG EARMUFF + = 38dB MAXIMUM PROTECTION
In some environments, wearing both earplugs and earmuffs is required for maximum protection, however attenuation is limited due to flanking sound transmission paths in the skull. Therefore the attenuation values of each individual hearing protector cannot be simply added.
How to Estimate Protected Noise Level with Dual Protection - Examples
To estimate protected noise level, add 5 dB to the higher NRR (Noise Reduction Rating) protector.
20 I PERSONAL SAFETY EQUIPMENT CATALOGUE VOL 2
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