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Toolbox talk · 10 min · PPE

Hearing Protection Fit

Hazards: Noise-induced hearing loss · Tinnitus · Missed warning signals and back-up alarms from overprotection

Why it matters

Every ear canal is a different size and shape, so the same earplug protects two people by very different amounts. That is the whole point of OSHA's 2026 bulletin on hearing protector fit testing, which notes that roughly 20 percent of workers in high-noise industries — construction, manufacturing, mining, utilities — already have noise-induced hearing loss. A plug that is not sealed is close to no plug at all, and nothing on the package tells you whether yours is sealed.

Key points

  • The number on the box is a lab number. OSHA subtracts 7 dB from the labeled NRR and then cuts what is left in half for real workplaces. An NRR 33 plug is credited with about 13 dB — and only if it is in correctly.
  • Roll, pull, hold. Roll the foam into a thin ribbon with clean hands. Reach over your head and pull the top of the ear up and back to straighten the canal. Insert, then hold until the foam expands. OSHA's own manual says it in exactly those three words.
  • Check the seal, every time. Your voice should sound muffled once the plug seals. Then count out loud while cupping and uncupping your hands over your ears: with a good fit, your voice barely changes.
  • Plugs are individual, and that is in the standard. 29 CFR 1926.101(b): devices inserted in the ear "shall be fitted or determined individually by competent persons." Same section, next line: plain cotton is not an acceptable protective device.
  • Enough protection, not the most protection. OSHA's guidance is to bring exposure down to 75-85 dBA. Overprotection means missed back-up alarms and radios — or plugs pulled out to hear, which protects nobody.
  • Plugs and muffs together add about 5 dB. Not double. Worth it above 100 dBA or with impulse noise over 140 dB, and no substitute for getting the first device sealed.

Do / Don't

Do

  • Clean hands before touching a plug.
  • Reseat plugs after eating, drinking or talking on the phone.
  • Try a different size or type if a plug will not seal — the employer has to offer a selection.
  • Ask about fit testing; OSHA calls it a best practice and a training tool.

Don't

  • Push an unrolled foam plug into your ear.
  • Trust the NRR on the package as your real protection.
  • Wear plugs so dirty or hardened that they no longer expand.
  • Use music headphones as hearing protection — they are not protectors.

Quick site check

  • Do we have more than one size and type of plug on the truck today, plus muffs that fit our hard hats?
  • Watch three crew members insert plugs right now — roll, pull, hold, or straight in?
  • Are the plugs in anyone's pocket dirty, torn or too hard to expand?
  • Which tasks today are over 100 dBA and might call for plugs and muffs?
Discussion — ask the crew
  1. Pull out the plugs you are wearing right now — were they rolled down before they went in, or pushed in as-is?
  2. Which tasks on this site do you do without protection because you would only be in the noise for a minute?
  3. Has anyone here ever had their earplug fit checked or fit tested? What did it tell you?
  4. Where on this job do you take your protection out so you can hear a signal or a radio?
  5. Do we stock more than one size and type of plug, and do we have muffs available for the hard hats?
Refs: OSHA Field Safety and Health Management System Manual, Chapter 16 — Hearing Conservation Program (the Roll, Pull, Hold earplug insertion method) · OSHA #ListenUp — Hearing Conservation in Construction toolbox talk (the cup-and-uncup fit check; aim for 75-85 dBA; avoid overprotection) · OSHA Safety and Health Information Bulletin SHIB 02-17-2026 — Hearing Protector Fit Testing · 29 CFR 1926.101 — Hearing protection (individual fitting by competent persons; plain cotton is not acceptable) · 29 CFR 1910.95 — Occupational noise exposure, paragraphs (i) and (j) and Appendix B (hearing protector attenuation methods) · OSHA Technical Manual, Section III Chapter 5 — Noise (dual protection adds only 5 dB of attenuation)Sign-in sheet included in the printed version

Frequently asked questions

OSHA's own hearing conservation manual gives three steps: roll the plug into a small thin ribbon with clean hands, pull the top of your ear up and back with the opposite hand to open the canal, then hold the plug in place until it expands. Your voice will sound muffled when the plug has sealed.

Count out loud while slowly cupping and uncupping your hands over your ears. With a good fit, your voice sounds about the same either way. If cupping your hands makes a big difference, the plugs are not sealing.

No. The NRR is a laboratory number. OSHA subtracts 7 dB to compare it with an A-weighted level, and applies a 50 percent safety factor for real workplaces — about 13 dB of credit for an NRR 33 plug. NIOSH derates by protector type instead, and in 2025 recommended individual fit testing over derating altogether.

No. OSHA's Technical Manual states that dual protection adds only about 5 dB over the better of the two devices. It is worth doing at very high levels — OSHA suggests considering it at 100 dBA and above, or with impulse noise over 140 dB — but it does not double anything.

Yes, and OSHA says so. Aim for enough reduction to bring exposure down to 75-85 dBA. Overprotection makes workers less aware of their surroundings, or leads them to take protectors out to hear, which leaves them exposed.

Sources & references

Content checked against these sources — last reviewed August 28, 2026.

Results are estimates for planning purposes and do not replace a competent person's evaluation or an engineer's design. Follow the OSHA standards that apply to your work and your employer's written program.

By — Editorial team of SteelToeTools.com (published by LSEA SAS) Updated