Product Selection Guides
Noise Reduction Rating (NRR) is the measure, in decibels, of how well a hearing protector reduces noise, as specified by the Environmental Protection Agency. The higher the number, the greater the noise reduction. When dual protectors are used, the combined NRR provides approximately 5 decibels more than the higher rated of the two products. For example, using ear plugs (NRR of 29 decibels) with ear muffs (NRR 27) would provide a Noise Reduction Rating of 34 decibels.
*Noise Reduction Ratings are listed within the product description for each hearing protector.
Examples of Noise Levels
The amount of on-the-job noise exposure can be determined through various testing devices. Excessive noise is defined as 85-90 decibels or more over an 8 hour period.
A sampling of noise levels is as follows:
- Normal Concentration - 60dB
- Sanding - 85dB
- Woodworking - 100dB
- Power Saw - 110dB
- Auto Traffic - 75dB
- Subway - 90dB
- Drilling (pneumatic) - 100dB
- Gunfire - 120dB
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