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KMID : 0895419960060010038
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Journal of Korean Society of Occupational and Enviromental Hygiene
1996 Volume.6 No. 1 p.38 ~ p.54
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A Review on Fit Test for Respirators and the Regulations
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Willeke, Klaus
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Abstract
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Respirator fit testing is required before entering specific work environmentals to ensure that the respirator worn satisfies a minimum of fit and that the user knows when the respirator fits properly. The fit of a respirator can be determined by qualitative (QLFT) or quantitative fit test (QNFT). The QNFT, having been universally accepted more than the QLFT, provide an objective and numerical basis by measuring a fit factor (FF). Until a few years age, only one QNFT technique was available and accepted by U.S. Occupational Safety and Health Administration (OSHA) regulations. In the 1980´s and 1990´s, several new and fundamentally different QNFT methods were developed. Two of the newer methods are commercially available and are accepted by OSHA as suitable alternatives. In this articles, the principle of operation of each ONFT technique is explained and each technique´s major advantages and disadvantages are painted out. Emphasis is given to negative-pressure air-purifying respirators, as they are in most frequent use today. The requirements and recommendations for fit testing positive-pressure respirators are discussed as well. Finally, the presently available QNFT standards and regulations are summarized to assist the user in making fit testing decisions.
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KEYWORD
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