Worker Health and Safety
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.
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.
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.
Hearing protection
Noise-induced hearing loss is 100% preventable with properly fitted hearing protection.
Product categories
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Hearing protection
Ear muffs
- Protect your hearing in noisy environments
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Hearing protection + situational awareness
3M™ Peltor™ Headsets and In-Ear Solutions
- Protect your hearing in noisy environments
- Stay aware of instructions and alarms
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Hearing protection + situational awareness + communication
3M™ Peltor™ Protective Communications
- Protect your hearing in noisy environments
- Stay aware of instructions and alarms
- Communicate with others
Ensure your hearing protection products aren’t falling short
Hear how the 3M™ E-A-Rfit™ Dual-Ear Validation System can quantitatively test the effectiveness of your hearing protection.
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Technical Assistance: 1-800-267-4414
Technical Assistance: 1-800-267-4414
Customer Service: 1-800-3M-HELPS (364-3577)
Customer Service: 1-800-3M-HELPS (364-3577)
