Almost all elements of the respiratory protection program affect respirator users and their
knowledge of the principles of respiratory protection is integral to an effective program. Elements that have a more
direct impact on the user include knowledge of selection criteria, medical evaluations, procedures for proper use,
fit-testing, and maintenance procedures. Proper selection and, if appropriate, fit testing of tight fitting
face pieces will assure that the respirator will provide adequate protection against the contaminants that affect use.
Medical evaluations are necessary to determine whether the user is fit to wear a respirator without adverse health
effects. Training on procedures for proper use and maintenance will assure the wearer that the wearer is using the
respirator in a safe and healthful manner.