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APPENDIX B.1. PROCEDURES FOR FIT CHECKING <br />The seal of a respirator should be tested prior to entering a contaminated <br />atmosphere by procedures recommended by the manufacturer or by the following <br />fit checks. <br />Irritant or Odorous Chemical Agent <br />The wearer is exposed to an irritant smoke, isoamyl acetate vapor, or other <br />suitable test agent easily detectable by irritation, odor, or taste. An <br />air-purifying respirator must be equipped with the appropriate air-purifying <br />element. If the wearer is unable to detect penetration of the test agent, <br />the respirator is probably tight enough. <br />FIGURE B-1. Odorous vapor check test <br />-147- <br />