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Development of an advanced respirator fit-test headform.

Bergman MS; Zhuang Z; Hanson D; Heimbuch BK; McDonald MJ; Palmiero AJ; Shaffer RE; Harnish D; Husband M; Wander JD
J Occup Environ Hyg 2014 Feb; 11(2):117-125
Imporved respirator test headforms are needed to measure the fit of N95 filtering facepiece respirators (FFRs) for protection studies against viable airborne particles. A Static (i.e., non-moving, non-speaking) Advanced Headform (StAH) was developed for evaluating the fit of N95 FFRs. The StAH was developed based on the anthropometric dimensions of a digital headform reported by the National Institute for Occupational Safety and Health and has a silicone polymer skin with defined local tissue thicknesses. Quantitative fit factor evaluations were performed on seven N95 FFR models of various sizes and designs. Donnings were performed with and without a pre-test leak checking method. For each method, four replicate FFR samples were tested of each of the seven models with two donnings per replicate, resulting in a total of 56 tests per donning method. Each fit factor evaluation was comprised of three one minute exercises: "Normal Breathing" (NB, 11.2 liters per minute (lpm)), "Deep Breathing" (DB, 20.4 lpm), then NB again. A fit factor for each exercise and an overall test fit factor were obtained. Analysis of variance methods were used to identify statistical differences among fit factors (analyzed as logarithms) for different FFR models, exercises, and testing methods. For each FFR model and for each testing method, the NB and DB fit factor data were not significantly different (P > 0.05). Significant differences were seen in the overall exercise fit factor data for the two donning methods among all FFR models (pooled data) and in the overall exercise fit factor data for the two testing methods within certain models. Utilization of the leak checking method improved the rate of obtaining overall exercise fit factors > 100. The FFR models, which are expected to achieve overall fit factors > 100 on human subjects, achieved overall exercise fit factors > 100 on the StAH. Further research is needed to evaluate the correlation of FFRs fitted on the StAH to FFRs fitted on people.
Respirators; Respiratory-protective-equipment; Face-masks; Filters; Personal-protection; Personal-protective-equipment; Sampling; Models; Statistical-analysis; Author Keywords: N95; fit test; headform; N95 respirator; advanced headform
Ziqing Zhuang, Technology Research Branch, National Personal Protective Technology Lab, National Institute for Occupational Safety and Health, 626 Cochrans Mill Road, Building 13, P.O. Box 18070, Pittsburgh, PA 15236
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Healthcare and Social Assistance
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Journal of Occupational and Environmental Hygiene
Page last reviewed: April 1, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division