| Document ID (ISN) | 64211 |
| CIS number |
95-638 |
| ISSN - Serial title |
0002-8894 - American Industrial Hygiene Association Journal |
| Year |
1994 |
| Convention or series no. |
|
| Author(s) |
Krishnan U., Willeke K., Juozaitis A., Myojo T., Talaska G., Shukla R. |
| Title |
Variation in quantitative respirator fit factors due to fluctuations in leak size during fit testing |
| Bibliographic information |
Apr. 1994, Vol.55, No.4, p.309-314. Illus. 13 ref. |
| Abstract |
In a controlled human study, fit factors were determined by an aerosol filter fit test and the newly developed dichotomous-flow fit test. For a higher level of respirator fit (aerosol fit factors > 1000), the aerosol fit factors were 30-60 times the corresponding flow fit factors, while for a lower level of respirator fit (fit factors < 1000) they were 2 to 4 times the flow fit factors. In a similar mannequin study considerably lower variation in fit factors was found. However, the variation in the aerosol method relative to the flow method, in the human study, is of the same magnitude as in the mannequin study. This suggests that the higher variation in the human tests is mainly due to variations in face-seal leak size and not to increased systematic errors. It was estimated that the fluctuations in face-seal leak size for the subjects with the high fit factor varied between 0.5mm and 0.7mm, and between 1.0mm and 1.3mm for the subject with the low fit factor. Thus, the fit factor determined for a human cannot be expected to be constant, even for the most perfect test system. |
| Descriptors (primary) |
evaluation of equipment; leakage testing; respirators; personal protective equipment |
| Descriptors (secondary) |
equipment testing; human experiments |
| Document type |
D - Periodical articles |
| Country / State or Province | Japan; Lithuania; USA |
| Subject(s) |
Personal protection
|
| Broad subject area(s) |
Chemical safety
|
| Browse category(ies) |
Respiratory protection
Personal protection
|
