What is Class 5 Protection?

Australian and New Zealand Safety Standards rate hearing protection into five classes, with Class 1 being the lowest level of protection and Class 5 being the highest level.
Class 5 protection earplugs guard people in loud environments where noise may cause permanent damage. They protect workers on construction sites, manufacturing facilities, and military installations. The Aus/NZ rated class 5 hearing protection provides protection against exceptionally high-volume sounds that may be hazardous to your ears due to the disruptive nature they often encounter on job sites or other places with excessive noise levels, such as airports, fireworks, chainsaws, etc.

What is NRR

The term “Noise Reduction Rating” (NRR) helps assess the efficacy of hearing safety devices in reducing sound intensity within a specified environment. The higher an object’s NRR, the better it will be to block loud noises like explosions or gunfire without causing you hearing loss!
You should aim for ear protection with much higher ratings, such as those over 30 dB. Depending on the sound level you want to block, you should aim for ear protection with a noise reduction rating of at least 22 dB.
The highest NRR rating for earplugs is 33, and the highest available NRR rating for earmuffs is 31.