Earplug Fit and Insertion

What it is

Earplugs only work when they seal deep in the ear canal. Poor insertion is the main reason real-world protection falls far below the label NRR. OSHA 29 CFR 1910.95(k) requires training on the use, fitting and care of hearing protectors. ANSI S12.71 covers field systems that measure how much attenuation a person actually gets, called a Personal Attenuation Rating (PAR).

How to insert (roll-pull-hold for foam plugs)

1. Roll. With clean hands, roll the plug into a thin, crease-free cylinder.
2. Pull. Reach over the head with the opposite hand and pull the top of the ear up and back. This straightens the canal.
3. Insert. Slide the rolled plug well into the canal.
4. Hold. Hold it in place with a fingertip while it expands, about 20 to 30 seconds.
5. Check. Little of the plug should show from the front. The wearer's own voice should sound louder and muffled.

Plug types and insertion

Fit check

• Cup both hands over the ears, then release. With a good seal, the change in sound is small.
• If noise sounds much louder when the hands come off, reinsert.
• Fit testing systems under ANSI S12.71 play test tones or use microphones to give a PAR for each ear. Use them for training, new hires and workers with threshold shifts.

Key points

• Pre-molded plugs come in sizes. One size does not fit all canals.
• Reuse plugs only as the maker allows. Dirty foam loses its shape and can irritate the ear.
• Insert before entering noise, not after.

Common mistakes

• Pushing a foam plug in without rolling it.
• Inserting only the tip and leaving most of the plug outside.
• Rolling plugs with dirty hands.
• Assuming the label NRR applies to every wearer.

Governing standards: 29 CFR 1910.95(i), (j) and (k); ANSI S12.71.

Reference only. Verify against the current governing code or standard, the manufacturer's data and the project documents before use. Apps for Distributors disclaims liability arising from reliance on this reference.