Effectiveness of Fit Check Methods on Half Mask Respirators

Myers, Walter Dean; Jaraiedi, Majid; Hendricks, Lynnette

doi:10.1080/1047322x.1995.10387716

Cited by 14 publications

(10 citation statements)

References 6 publications

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“…This also supports Myers' (13) finding that USCs were less useful when the initial fit was already good. (13) It is likely that the other two models show improvement because the USC caused subjects to take added care while donning (as suggested by Myers), and this led to better donnings (i.e., the added care from performing a USC led to donnings of higher quality).…”

Section: Discussionsupporting

confidence: 88%

“…Myers et al (13) observed some differences in USC effectiveness between elastomeric half mask respirators and FFRs. Furthermore, some experts have expressed concerns about the effectiveness of a USC with FFRs because FFRs differ from their elastomeric counterparts in that the entire body of the FFR is composed of porous (air permeable) filtration media.…”

Section: Discussionmentioning

confidence: 97%

“…(13)(14)(15)(16) Prior to 1998 (when positive and negative pressure USCs were still called +/− fit checks), Myers et al (14) compared the number of successful donnings in two groups of 32 each inexperienced respirators users (one group was trained to perform a +/− fit check and the second was not) for three models of FFRs and one model of elastomeric dual-cartridge half mask respirator. In general, the group that performed the +/− fit check on the FFRs achieved fewer unsuccessful donnings and more consistent donnings; however, the +/− fit check was shown to be less useful when there was already a good initial fit of the FFR.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of the Benefit of the User Seal Check on N95 Filtering Facepiece Respirator Fit

Viscusi

Bergman

Zhuang

et al. 2012

Journal of Occupational and Environmental Hygiene

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The objective of this study was to better understand the benefit of the user seal check step for respirator test subjects in the N95 filtering facepiece respirator donning process. To qualify for the study, subjects were required to pass a standard quantitative fit test on at least one of the three N95 filtering facepiece respirator models: 3M 1860 (cup), 3M 1870 (flat-fold), and Kimberly Clark PFR95-270 (duckbill). Eleven subjects were enrolled and performed a series of abbreviated, quantitative fit tests where they were randomly asked either to perform or not perform a user seal check with 20 different respirator samples of each model. The experimental design included 3 respirator models × 10 subjects × 2 treatment levels with 10 replications. Geometric mean (GM) fit factors and percentages of times a fit factor ≥ 100 was achieved for a donning were compared for each subject with and without the user seal check across all models and for each model. Higher GM fit factors and smaller geometric standard deviations across all models were achieved for 10 of the 11 subjects when performing a user seal check compared with not performing a user seal check. Geometric mean fit factors of 148, 184, and 156, compared with 126, 187, and 115, respectively, were obtained for the 3M 1860, 3M 1870, and Kimberly Clark PFR95-270 models when the user seal check was performed vs. not performed. Differences in the GM fit factors for the 3M 1860 and Kimberly Clark PFR95-270 models were statistically significant (p < 0.05) when performing a user seal check vs. not performing a user seal check. These data suggest that there may be some benefit to performing the user seal check for at least some models during the filtering facepiece respirator donning process for workers who have previously passed a fit test for those respirator models. Additional research is needed with larger groups of subjects and respirator models/types.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 97%

mentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of the Benefit of the User Seal Check on N95 Filtering Facepiece Respirator Fit

Viscusi

Bergman

Zhuang

et al. 2012

Journal of Occupational and Environmental Hygiene

View full text Add to dashboard Cite

show abstract

“…10,20,21 Previous experimental studies on U.S. subjects suggested that the user seal check improved the donning of N95 respirators. 23,24 Although the scale of these studies was not large enough (N = 11 and N = 64), 23,24 the rigor of the experimental design and the use of repeated measurements increased the credibility of the results. Some guidelines suggest that no further fit testing is needed for a given respirator if subjective leakage is detected by a user seal check.…”

mentioning

confidence: 99%

Evaluation of the user seal check on gross leakage detection of 3 different designs of N95 filtering facepiece respirators

Lam

Lui

Lee

et al. 2016

American Journal of Infection Control

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“…Before fit testing, male subjects were asked to shave and to quit smoking at least an hour before the actual test run in order to reduce any bias from tobacco aerosols 15) . In addition, after becoming familiarized with the use of the respirators and test procedures, both positive and negative fit checks, were conducted to all subjects to check if the respirator was properly adjusted to the face 16) . After checking fits and adjustment, subjects were asked about any leakages into the respirator.…”

Section: Quantitative Fit Testing Apparatus and Proceduresmentioning

confidence: 99%

Facial Anthropometric Dimensions of Koreans and Their Associations with Fit of Quarter-Mask Respirators.

et al. 2003

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Past studies on respirator fit or performance have mostly been done for Whites or male subjects, and little attention has been paid to minorities and Asians. To fill this gap, this study was designed to provide facial anthropometric data for Koreans and to analyze the association between facial dimensions and respirator fit factors for three brands of quarter-mask respirators, two domestic and one imported brand, using a Portacount™ 8020. A total of 110 university student subjects, 70 males and 40 females volunteered for participation in the study. The results of this study showed that Korean males and females have different facial dimensions as compared with those of White males and females. Unexpectedly, the imported respirator performed better than the domestic respirators. Males were found to achieve better respirator fit than females regardless of respirator brands tested. The regression analysis found no common prognostic variables with the three respirator brands studied. A stepwise logistic regression analysis was conducted to find predictive facial dimensions with respirator fits. Some facial dimensions were found to be statistically significant, but these dimensions are different from the traditionally recommended facial dimensions of face length and lip width for quarter mask. To improve respirator fit for Koreans, these different facial characteristics need to be considered in the design of quarter mask respirators.

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Effectiveness of Fit Check Methods on Half Mask Respirators

Cited by 14 publications

References 6 publications

Evaluation of the Benefit of the User Seal Check on N95 Filtering Facepiece Respirator Fit

Evaluation of the Benefit of the User Seal Check on N95 Filtering Facepiece Respirator Fit

Evaluation of the user seal check on gross leakage detection of 3 different designs of N95 filtering facepiece respirators

Facial Anthropometric Dimensions of Koreans and Their Associations with Fit of Quarter-Mask Respirators.

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