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The adeptness to account fit factors (FFs) is additionally a claim for the alone administering a quantitative fit analysis (QNFT). A FF is “a quantitative appraisal of the fit of a accurate respirator to a specific individual, and about estimates the arrangement of the absorption of a actuality in ambient air to its absorption central the respirator back worn.”

As authentic in the standard, a QNFT agency “an appraisal of the capability of respirator fit by numerically barometer the bulk of arising into the respirator.” A QNFT is all-important for respirators that charge accomplish a FF of greater than 100. This agency that in adjustment to fit analysis a abounding face air antibacterial respirator (APR) to access its best APF of 50 (as authentic in OSHA’s proposed APF aphorism appear on June 6, 2003), a QNFT charge be used.

The acumen there’s a aberration amid FFs and APFs is that APFs about absorb a assurance agency of 10. This assurance agency is all-important because APFs in the abode tend to be lower than the FFs accomplished during fit testing. In adjustment to fit analysis a abounding face APR to an APF of 50, a FF of 500 (APF of 50 times the assurance agency of 10) would charge to be achieved.

A QNFT uses an apparatus to booty a sample from aural the wearer’s breath area while the respirator is actuality worn. In accession to the instrument, a claiming abettor and a probed respirator (or probed adapter for a accepted respirator) are all-important to accomplish a QNFT. A QNFT is added absolute than a qualitative fit test; it’s additionally beneath frequently performed because of the complication of the action and the prohibitive amount of the analyzation instrument. The agreement for a QNFT is abundant in Appendix A, subpart C to 29 CFR 1910.134.

The accepted defines a qualitative fit analysis (QLFT) as “a pass/fail fit analysis to appraise the capability of respirator fit that relies on the individual’s acknowledgment to the analysis agent.” A QLFT, according to 29 CFR 1910.134(f)(6), “may alone be acclimated to fit analysis abrogating burden air-purifying respirators that charge accomplish a fit agency of 100 or less.” In added words, a QLFT can be acclimated alone to verify an APF of up to 10 (FF of 100 ? 10 percent assurance agency = APF of 10).

This commodity originally appeared in the May 2004 affair of Occupational Health & Safety.

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