Qualitative testing is a pass/fail test which assesses the adequacy of respirator fit based on the individual’s response to a test media. The pass/fail criteria is determined by an individual’s response to sensory testing (smell or taste). The subject dons their respirator and a fit test hood. The test aerosol (Saccharin or Bitrex) is sprayed inside the hood while the subject performs prescribed exercises. If the subject can taste/smell the test agent, the respirator fails the test and another respirator must be tested.