Selecting a high NRR hearing protector for an environment where only good high frequency attenuation is needed, will lead to unnecessary insulation and communications difficulties
How to use the NRR
When the dB(C) noise level is known, you don’t have to adjust the NRR:
Noise level at ear: dB(C) – NRR =< 90 dB (*)
When the noise level is known in dB(A) the NRR must be reduced by 7 dB:
Noise level at ear: dB(A) – [NRR -7] =< 90 dB (*)
(*) If a threshold shift (hearing damage) exists the noise level at the ear must be 85 dB or less.
Uncorded – 200 pairs per box
Corded – 100 pairs per box
Tapered shape to ft the ear canal comfortably
Soft foam seals the ear comfortably
Smooth, dirt resistant surface for hygiene
Comfortable for a wide range of ear sizes
Bright orange color for visibility
Twin-Cup® – headband
NRR 29 dB
Patented Twin-Cup® design
Highest NRR for any ear muff tested by an accredited lab
3M™ Reusable Ear Plug Corded
Individually packed – 100 pairs/box
Reusable, multi-fange designed ear plug
Fits securely in the ear canal and helps provide
Bright orange color provides high visibility to
allow employers to indentify employees wearing
their ear plugs.
Soft cloth cord helps prevent loss of ear plugs.
Can be washed and reused many times.
Noise Reduction Rating (NRR)*: 24dB