Why is quantitative fit testing (QNFT) better than qualitative fit testing (QLFT)?
QNFT is a better test because it eliminates the subjectivity of QLFT. A quantitative fit test is not affected by the person’s sense of smell, taste or sensitivity to irritant chemicals. One of the most appreciated aspects of QNFT is that the test subject cannot deceive the test operator, as often happens with QLFT. In addition, QLFT is not technically suitable for determining the high level of fit required for full-face respirators. QLFT’s are only designed for a pass/fail level of 100. Since full-face masks require at least 500 or 1000, only QNFT should be used. Refer to TSI Applications Note ITI-032 Don’t Use Qualitative Fit Testing for Full-face Respirators for more detail.
Related Questions
- The expense of quantitative fit testing instrumentation seems high compared to the cost of qualitative fit testing supplies. How can I justify this expense to my managers?
- Does OSHA give employers a choice of using either qualitative (QLFT) or quantitative (QNFT) fit test methods?
- Why is quantitative fit testing (QNFT) better than qualitative fit testing (QLFT)?
