What is NRR?
Wearing time is often overlooked by HPD buyers who select devices based on maximum ratings (highest NRR) without enough attention given to comfort or the potential noise in a given environment. NRR is also affected by employees who remove HPD’s to communicate. This obviously reduces the effectiveness of the hearing protection device. When hearing protectors are not worn 100% of the time protection drops to less than half the stated protection level after only 30 minutes during eight hours of noise exposure.