How to Verify a Respirator Is NIOSH Approved

Why this matters

A counterfeit filtering facepiece looks exactly like the real one on the shelf. It has the cup shape, the nose clip, the "N95" printed on the front. What it may not have is a filter that stops 95 percent of the test aerosol, or a seal that holds when the wearer is breathing hard in an attic full of blown cellulose. Nobody notices at the job, because a failed respirator does not feel different from a working one. The exposure shows up years later, or never gets connected to the box of masks bought cheap during a shortage.

There is also a plain compliance stake. Where your employees are required to wear a respirator, OSHA's respiratory protection standard requires the employer to select a NIOSH-certified respirator and use it within the conditions of that certification (29 CFR 1910.134(d)(1)(ii), which the construction standard at 1926.103 incorporates). A mask with a fake approval is not a certified respirator, whatever the box says. The program itself (medical evaluation, fit testing, training) is covered in How to Decide Whether a Task Needs a Respirator; this article covers only the question of whether the thing in your hand is what it claims to be.

What NIOSH approval actually is

NIOSH, the National Institute for Occupational Safety and Health, tests and certifies respirators under 42 CFR Part 84. An approval is issued to an approval holder (the company that submitted the respirator and is responsible for its quality system) and carries a TC number, short for testing and certification. The prefix tells you the class of device:

Two facts about approval trip people up. First, the approval holder is not always the name on the box. NIOSH allows private labeling, so a respirator can be sold under a distributor's brand while the approval belongs to the manufacturer. The approval list shows both, and a mismatch is only a problem when the list does not show the relationship. Second, an approval covers an assembly, not a part. A reusable half-mask is approved with specific cartridges and filters from the same approval holder. Put another maker's cartridges on that facepiece and the combination is no longer an approved respirator, even though both pieces are individually genuine. See related: Combination Listings and the Mix-and-Match Trap.

Step 1: Read the markings on the respirator itself

Start with the device, not the packaging, because packaging is the easiest thing to fake and the easiest thing to swap. On a filtering facepiece, NIOSH requires the respirator itself to carry an abbreviated approval label printed on the facepiece or the straps. Look for all of these:

  Mock abbreviated label on a filtering facepiece

  [APPROVAL HOLDER NAME OR MARK]   MODEL 4400-N
  NIOSH                            N95
  TC-84A-XXXX                      LOT 24117A

Every field matters for a different reason. The approval holder name or registered mark ties the device to a company on the approval list. "NIOSH" in capital block letters is the certification claim. The TC number is the record you will look up. The filter class and efficiency (N95, R95, P100 and so on) tell you what was tested. The model number is what the approval actually lists. The lot number is what a recall or a rescission notice will name.

Why this step comes first: a box can be genuine while the masks inside were swapped, or the box can be printed perfectly while the masks carry nothing. If the facepiece itself has no TC number, stop here; the rest of the checks cannot rescue it.

For a reusable elastomeric facepiece, the abbreviated markings sit on the facepiece and on each filter or cartridge. The full approval label, which lists every approved combination of facepiece, cartridge and filter along with the cautions and limitations, comes in the packaging or the user instructions.

Step 2: Read the full approval label in the packaging

The full label is a table, and it is where the limitations live. It names each component part number, the combinations NIOSH approved, and lettered cautions and limitations: not for use in atmospheres immediately dangerous to life or health, limits on oil aerosols for an N-series filter, change-out requirements for cartridges, and so on.

Why it matters: the label decides whether the respirator is approved for this use. An N95 is approved for particulates. It does nothing against solvent vapor from an adhesive, and no amount of correct marking changes that. The label is also the document you file, because it is what shows a later reader that the assembly in use matched an approved configuration.

What breaks if you skip it: a genuine respirator used outside its approval, which is the same compliance position as a fake one.

Step 3: Look the TC number up on the Certified Equipment List

NIOSH keeps a public, searchable Certified Equipment List (the CEL) on its website. Search by TC number. A genuine entry shows the approval holder, the model numbers covered, the filter class, and the approval status.

Match three things, not one:

1. The TC number exists. A number that returns nothing is a fabricated approval.
2. The approval holder matches the name or mark on the respirator, or the CEL shows a private-label relationship to the name on the box.
3. The model number on the respirator is listed under that TC number.

Why three: counterfeiters copy real TC numbers. A real number printed on a fake mask returns a perfectly good CEL entry, just for a different company's different model. The number alone proves only that the forger could read someone else's box.

Also check whether the approval is still in force. NIOSH revokes or rescinds approvals and posts notices, and a respirator manufactured under a rescinded approval is not a certified respirator for required use.

Step 4: Compare against the counterfeit signs NIOSH publishes

NIOSH maintains a page on counterfeit respirators and misrepresentation of NIOSH approval, with photographs of seized products. The signs it lists for filtering facepieces include:

• No markings at all on the facepiece.
• No approval (TC) number on the facepiece or headband.
• No NIOSH markings, or "NIOSH" spelled wrong.
• Decorative fabric or add-ons, such as sequins.
• Claims of approval for children. NIOSH does not approve respirators for children.
• Ear loops instead of headbands. NIOSH-approved filtering facepieces generally use headbands that go around the head; ear loops are the signature of products made to other standards. NIOSH's own page says generally, so treat ear loops as a strong flag that sends you back to the CEL entry, which will say what strap configuration was approved.

A mask marked only with a foreign standard (a KN95 marking, for example) is not claiming NIOSH approval at all, so it is not a counterfeit in the narrow sense. It is simply not a certified respirator for required use under 1910.134.

Step 5: Record what you verified, then decide

Write down the TC number, approval holder, model, lot and the date you checked the CEL, against the purchase it came from. Then the decision:

• All checks pass: the respirator goes into stock for the uses its label approves.
• Any check fails: pull the whole lot, not the one mask you looked at, label it as suspect and set it aside so nobody grabs it. The handling from there belongs to The Suspect Counterfeit Quarantine SOP.

Why the whole lot: a lot is what a counterfeiter packs together. If one mask from a box of 20 is wrong, assume the 19 behind it are too.

Worked example: a reorder during a shortage

An insulation and air-sealing shop with six techs runs disposable N95s on every blown-cellulose and attic job, inside a written respiratory protection program. The usual supplier is backordered. The office finds 10 boxes of 20 from an unfamiliar online seller, with N95 printed on the box and a TC number on the side panel.

Step 1, the facepiece. The office manager opens one box. The masks carry "N95" and a model number, and "NIOSH" in block letters. The TC number is printed on the box only. Nothing on the facepiece or the straps. That is already a failure under Step 1, but she keeps going so she has a complete record for the supplier dispute.

Step 2, the full label. No approval table in the box, only a one-page leaflet in two languages describing how to put the mask on.

Step 3, the CEL. The TC number from the box does return an entry. The approval holder is a different company from the name on the box, there is no private-label relationship listed, and the model number on the masks is not among the models covered.

Step 4, the published signs. The masks have ear loops. The CEL entry for that TC number describes a headband model.

Step 5, the decision. All four checks failed, and Step 1 alone was sufficient. All 10 boxes, 200 masks, go into the quarantine bin with a dated label. None of them reached a truck, because the office checked at receipt rather than at the first job.

The interim fix. The shop has two jobs on the board that need respirators this week. The owner pulls enough masks from the remaining verified stock for those two jobs, about 4 days of use for the two crews involved, and holds the attic jobs scheduled after that until a verified order lands. A job delayed is the right outcome here; sending a tech into an attic with an unapproved mask is a decision the program does not allow, and no customer schedule changes that.

What would have changed the answer. If the masks had carried a full, correct abbreviated label and the CEL had listed the model under the box's own approval holder, the order would have passed even from an unfamiliar seller. The channel is a reason to look harder, not a verdict. The opposite also holds: a mask can pass every check here and still be the wrong respirator if the job has a vapor hazard the N95 was never approved for.

How to verify you got this right

• Re-run the CEL lookup on a mask you know is genuine from your regular stock. If you cannot find that one either, the problem is your search, not the supplier.
• Check the lot number against the receipt. The lot you recorded should be the lot the purchase record says arrived. A mismatch means boxes got mixed in storage.
• Spot-check at the truck, not just at receiving. Pull one mask from each tech's supply once a quarter and run Step 1 and Step 3 on it. Stock gets moved, and a box picked up at a hardware counter on the way to a job never passed through receiving at all.
• Confirm the fit test matches the model. A fit test passed on one model does not transfer to another, and a supply substitution is exactly when a tech ends up wearing a model nobody fit-tested them on.

References

• 42 CFR Part 84, Approval of Respiratory Protective Devices (NIOSH certification)
• 29 CFR 1910.134, Respiratory Protection; 29 CFR 1926.103 for construction
• NIOSH Certified Equipment List and NIOSH guidance on counterfeit respirators and misrepresentation of approval
• See related: Provenance Is Part of the Rating; The Suspect Counterfeit Quarantine SOP; The Respirator Box With the Wrong Approval Number
• See related: How to Decide Whether a Task Needs a Respirator; Combination Listings and the Mix-and-Match Trap