4.1 Donning, facial hair and the user seal check

1 The facial hair rule, exactly as written

Paragraph (g)(1)(i): the employer shall not permit respirators with tight-fitting facepieces to be worn by employees who have:

(A) Facial hair that comes between the sealing surface of the facepiece and the face or that interferes with valve function; or (B) Any condition that interferes with the face-to-facepiece seal or valve function.

Read the wording precisely, because it is narrower and more sensible than the version people repeat. The rule is not “no beards”. It is that hair must not come between the sealing surface and the face. Facial hair entirely outside the sealing surface — a moustache that stays above the seal line, a soul patch below it, sideburns clear of the edge — does not violate (g)(1)(i)(A). Stubble along the seal line does.

Subparagraph (B) is broader than hair. Scars, a missing denture that changes cheek shape, a piercing under the seal line, a bandage — anything that interferes with the face-to-facepiece seal or with valve function is covered by the same prohibition.

2 Glasses, goggles and the rest of the head

Paragraph (g)(1)(ii): if an employee wears corrective glasses or goggles or other personal protective equipment, the employer shall ensure that such equipment is worn in a manner that does not interfere with the seal of the facepiece to the face of the user.

On a half mask this is usually manageable. On a full facepiece it is not: ordinary spectacle temples pass straight through the sealing surface, and the answer is a manufacturer's spectacle kit mounted inside the facepiece. Buying that kit is part of providing a respirator that is acceptable to, and correctly fits, the user under (d)(1)(iv).

The same competition for space applies to hard hat suspensions, welding helmets, hearing protection and face shields. The order things go on matters, and it is one of the things (k)(1)(iv) means when it asks employees to demonstrate how to put on and remove the respirator — on their real head, with their real other equipment.

3 The user seal check

Paragraph (g)(1)(iii): for all tight-fitting respirators, the employer shall ensure that employees perform a user seal check each time they put on the respirator, using the procedures in Appendix B-1 or procedures recommended by the respirator manufacturer that the employer demonstrates are as effective as those in Appendix B-1.

Paragraph (b) defines it plainly: a user seal check means an action conducted by the respirator user to determine if the respirator is properly seated to the face.

Two checks are described in Appendix B-1. A positive pressure check: close off the exhalation valve and exhale gently; the facepiece should bulge slightly and hold, with no outward leakage. A negative pressure check: close off the inlet of the cartridges or filters, inhale gently so the facepiece collapses slightly, and hold the breath for about ten seconds; the facepiece should stay collapsed and no inward leakage should be detected.

The distinction from a fit test is the thing to teach. A fit test is annual, uses an OSHA-accepted protocol, and establishes that this model and size can seal on this face. A seal check is every single donning, takes seconds, and establishes that it has sealed this time. Neither substitutes for the other.

4 A donning sequence worth teaching

1. 1
   Inspect before you put it on. (h)(3)(i)(A) requires respirators used in routine situations to be inspected before each use and during cleaning. (h)(3)(ii) says what to look at: respirator function, tightness of connections, and the condition of the facepiece, head straps, valves, connecting tube and cartridges, canisters or filters — plus elastomeric parts checked for pliability and signs of deterioration.
2. 2
   Check the element is the right one and its NIOSH label is legible — paragraph (j).
3. 3
   Check the seal line is clean-shaven where a tight-fitting facepiece is used.
4. 4
   Don it, straps even, no twists, and settle the facepiece before tightening.
5. 5
   Positive and negative seal check, per Appendix B-1. If it fails, adjust and repeat; if it keeps failing, do not enter.
6. 6
   Then the other PPE, in an order that does not disturb the seal.

5 Watching the seal through the shift

A seal is not a permanent state. It degrades through a shift for entirely ordinary reasons, and each of them belongs in training.

Sweat and heat. Skin gets slick and the facepiece migrates. This is also where respirator use and heat stress interact: a facepiece adds heat load, and a crew that is overheating will find reasons to lift it.

Talking. Jaw movement breaks a marginal seal repeatedly. If a task requires constant communication, that is a selection issue — exactly what (l)(2)(i) asks program evaluation to assess.

Straps loosening. Elastomeric straps stretch. This is one reason (h)(3)(i)(A) puts an inspection before each use rather than weekly.

Bending and reaching. Work postures move the facepiece against the face. A seal that holds standing still may not hold overhead.

Paragraph (g)(2)(i) covers the environment side of the same problem: appropriate surveillance shall be maintained of work area conditions and degree of employee exposure or stress, and when there is a change that may affect respirator effectiveness, the employer shall reevaluate the continued effectiveness of the respirator.

6 Doffing without contaminating yourself

Taking a respirator off is the moment the contamination on the outside of it meets the person. Paragraph (g)(2)(ii)(A) points at the practical problem: employees leave the respirator use area to wash their faces and respirator facepieces as necessary to prevent eye or skin irritation associated with respirator use.

The habits that follow are simple. Leave the contaminated area before removing anything. Handle the facepiece by the straps rather than the front. Do not set it down on the work surface you have just been generating dust on. And wash hands before touching your face, because whatever was in the air is now on the outside of the mask and on your gloves.

Where the contaminant is one the substance-specific standards care about — lead, asbestos, silica — the doffing sequence is part of a wider hygiene requirement. 1926.62(i)(2)(iii) prohibits employees from leaving the workplace wearing protective clothing or equipment required during the shift, and 1926.1101 has its own decontamination architecture. The respirator is one item inside that sequence, not a separate question.