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In January 1998, OSHA published the final Respiratory Protection standard (29 CFR 1910.134). In the final revised respirator standard, OSHA set up a mechanism for OSHA's acceptance of new fit test protocols under Mandatory Appendix A. Any person may submit to OSHA an application for approval of a new fit test protocol, and if the application meets certain criteria, OSHA will initiate a rulemaking proceeding under 6(b)(7) of the OSH Act to determine whether to list the new protocol as an approved fit test protocol in Appendix A. OSHA has received a submission to consider three new quantitative fit test protocols that reduce the time required to complete the fit test while maintaining acceptable test sensitivity, specificity, and predictive value. Employers, employees, and safety and health professionals use fit testing to select respirators. Currently OSHA relies on fit testing methods specified in Appendix A of the final revised Respiratory Protection standard. When OSHA published the final Respiratory Protection standard in 1998, it allowed for later rulemaking on new fit test protocols. This rulemaking action will allow for the incorporation of new fit test protocols into 1910.134.