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Hi, do anybody know of the block/decrease the sound of industrial machines with the same level of sound like an angel grinder for example?
Generally you want earplugs with at least a Noise Reduction Rating of 27, for comfort I recommend an NRR of 33. I'll also wear ear muffs over my earplugs if I'm grinding in a small space or enclosed area. (If I'm grinding in a single car garage, it's louder with the garage door closed.)
grinding angels is a surefire path to hell.
or heaven, depends on where you stand.