The protection rating of a noise enclosure is the level of protection it provides against noise, usually measured in decibels (dB). According to national standards, there are five levels of protection for acoustic enclosures:
Protection level A: Provides 20 dB of protection.
Protection class B: Provides 25 dB of protection.
Protection level C: provides 30 dB of protection.
Protection level D: Provides 35 dB of protection.
Protection level E: 40 dB of protection is available.
Please note that the protection class of a noise enclosure may vary depending on national or regional regulations. When selecting a noise enclosure, the appropriate protection class should be chosen according to actual needs.