One test method depends on the wearer s ability to detect the presence of a test agent, such as saccharin. If the wearer can detect the test agent while wearing the respirator, then the face seal is not sufficient to provide adequate protection. Respirator fit testing procedures have been published by OSHA in 29 CFR 1910.125, Appendix D. Fit tests should be conducted annually. With some contaminants, such as lead and asbestos, tests must be given every six months. Training should also provide general information, such as how contaminants affect the human body and how respirators should be maintained.
Maintenance includes respirator cleaning, inspection, storage, and repair.
If chemical cartridges are used, they must be changed when the wearer can smell, taste, or feel irritation from the contaminant. Workers may resist using them, protesting that a respirator requires an extra step when preparing for work or is an additional item to carry. To encourage respirator use, employers and supervisors should follow the respirator training program with ongoing reminders, such as posters describing respiratory protection. As new workers are trained, experienced employees should attend refresher sessions. Verbal encouragement from respirator-clad supervisors is also a powerful motivating tool.