Variation in quantitative respirator fit factors due to fluctuations in leak size during fit testing.
Krishnan-U; Willeke-K; Juozaitis-A; Myojo-T; Talaska-G; Shukla-R
Am Ind Hyg Assoc J 1994 Apr; 55(4):309-314
A two part controlled study was conducted in an effort to determine the change in fit factors during quantitative respirator fit testing. The first part of the study focused on a high level of respirator fit and the second focused on a low level of respirator fit. The high respirator fit was obtained with a large size silicone half mask on the first subject and a low fit obtained with a medium size natural rubber half mask on the second. In a mannequin study, a half mask was fitted with a center probe and three artificial leaks of 0.84 millimeters internal diameter and 5 centimeters in length were introduced at the faceseal. Two methods of fit testing were used, an aerosol fit test and the dichotomous flow fit test. Due to fluctuations in the faceseal leak size, even for the same respirator fit there was a high degree of variation in the fit data collected. The authors conclude that the fit factors which are determined on a human cannot be expected to be constant even when the most perfect test system is used.
NIOSH-Publication; NIOSH-Grant; Respirators; Respiratory-protective-equipment; Respiratory-protection; Equipment-reliability; Testing-equipment; Face-masks
Environmental Health University of Cincinnati Dept of Environmental Health Cincinnati, Ohio 45267
Respirator Research; Respirators
American Industrial Hygiene Association Journal
University of Cincinnati, Cincinnati, Ohio