Half mask respirator and facial hair
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Effect of facial hair on the face seal of negative-pressure respirators. - PubMed - NCBI
However, some other types of respirators do not require a face seal, and thus, usually can be worn with facial hair, such as loose fitting powered air-purifying.
The effect of facial hair on the face seal of negative-pressure respirators, both half -masks and full facepieces, has been investigated. Three hundred and seventy.
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Effect of facial hair on the face seal of negative-pressure respirators.
Description:Your letter has been referred to the Directorate of Enforcement Programs for an answer to your question. Your paraphrased question and our response is below. Facial hair is allowed as long as it does not protrude under the respirator seal, or extend far enough to interfere with the device's valve function.