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It's an employer's responsibility to fit test workers with the respirators used on their job sites. Most folks don't think about this unless they are in highly regulated fields. But under OSHA safety standard 1910.134 employers are required to show each worker using this lung protection equipment how to put on a respirator, how to position it on the face, and how to determine an acceptable fit. If you've never performed a fit test, here is a quick primer on how to use a Qualitative Fit Tes …