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Noise Reduction Rating (NRR)
The NRR is a single-number method that describes the overall sound reduction across frequencies (attenuation) of an HPD in decibels (dB) based on  a laboratory test. Since the NRR is a laboratory test, it is recognized that it may overestimate the protection achieved by users in their workplace settings. Therefore, it is recommended that the NRR be derated in order to better estimate workplace protection. The NRR derating scheme can be found in CSA Z94.2-14 Hearing Protection Devices Standards, Table 2: Effective rating calculations for the NRR.
CSA Class
The CSA Class describes the sound level reduction (attenuation) of an HPD using the letters A, B, or C, which pre-assigns the HPD according to defined attenuation ranges. The CSA Class can be found in CSA Z94.2-14 Hearing Protection Devices Standards, Table 3: Assignment of class based on the octave band attenuation values measured according to ANSI S3.19. It is important to note that the Class pertains only to level of attenuation of the HPD, not to any of its other characteristics.
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