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MSA has NIOSH approval for use of the OptimAir TL PAPR with tight-fitting facepiece. This PAPR may be used for any number of job applications with loose-fitting hoods and tight-fitting facepieces. Facepieces now approved for use with the OptimAir TL PAPR are Advantage 3100, Advantage 4100, and Ultra Elite Facepieces. Other OptimAir TL PAPR accessories which have also recently been NIOSH-approved include the extended battery (10-12 hour), protective decon cover, and comfort belt.