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| • Is NRR a dependable value? |
| • What is REAT? |
| • Is a PAR like a NRR? |
| • Does Double Protection (ear muffs over insert hearing protectors) ensure protection? |
| • Can I use REAT to determine if Double Protection is needed? |
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| Q: Is NRR a dependable value? |
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| A: Not really. NRR is a value that is established in a laboratory setting – it is a theoretical protection value that is seldom achieved in day-to-day use by employees who use disposable hearing protectors. In fact studies have consistently demonstrated that nearly ˝ of employees using disposable hearing protectors receive less than 15 dB of protection – irrespective of the NRR of the device. |
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| Q: What is REAT? |
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| A: The REAT procedure was developed to test for “real world” hearing protection values. The employee is given two tests with a specially designed headset. One of the tests establishes hearing levels (like a hearing test) and the next test is performed after the employee inserts their hearing protectors. The difference between the tests establishes the exact amount of protection the employee is receiving. This is called a Personal Attenuation Rating or a PAR. |
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| Q: Is a PAR like a NRR? |
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| A: The REAT test results are computed according to the same formula that is used to establish NRR (ANSI S3.19.1974) based on the individual’s test scores. This single number rating for the individual is representative of the protection that the hearing protector was providing at the time of the test. The test can be performed for any type of insert HPD. |
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| Q: Does Double Protection (ear muffs over insert hearing protectors) ensure protection? |
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| A: While this practice will add some hearing protection, earmuffs are not a very good protection device and it will not double the amount of noise reduction. The insert protector still offers the primary protection so if they are not worn properly the addition of an earmuff only offers a few decibels of added protection. |
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| Q: Can I use REAT to determine if Double Protection is needed? |
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| A: Yes. By testing each individual and establishing a PAR you can establish the amount of protection that the individual is getting from their insert hearing protector. The confidence in consistent protection is higher with custom protection or custom CavCom ear sets as they can only be worn one way. |
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