Fit testing and fit factors for the N-95 respirators for protection against TB exposure.
OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.
March 4, 1996
Dr. John F. McCarthy, ScD, CIH
Ms. Nanette Moss
Environmental Health and
Engineering
255 Washington Street
Newton, Massachusetts 02158-1634
Dear Dr. McCarthy and Ms. Moss: