Quantitative fit-Test concordance of a pair of similar-fit 3M Aura respirator models, 3M 9320A and 3M 1870 : A randomized crossover study

Abstract

Objective: Some manufacturers provide information on similar-fit model pairings of filtering facepiece respirators (FFRs), suggesting that fit-Test outcome of one model helps predict the other. This guidance may be useful during crisis capacity when FFR supplies and/or fit tests are constrained. The purpose of this study was to compare quantitative fit-Test (QNFT) results and concordance between a pair of similar-fit 3M Aura FFRs: The 3M 9320A+ and 3M 1870+. Methods: All participants completed online training and a QNFT with both respirators. The order of the respirator being examined first was randomly allocated. The outcomes included QNFT pass rate, concordance between the 2 models, overal..