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Not everyone can wear a half- or full-face respirator while working. There are several conditions spelled out in the OSHA standards where respirator masks either won't work, or put the wearer in danger. The most frequent impediment to having a mask fit and therefore work properly is facial hair. OSHA is very specific in the new (1998) guidelines. In section 29 CFR 1910.134(g), Use of Respirators, it states: "Facepiece seal protection. The employer shall not permit respirators with …