Loading and filtration characteristics of filtering facepieces

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      <subfield code="c">C.C. Chen, M. Lehtimäki and K. Willeke</subfield>
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      <subfield code="a">The present study investigated why respirators of the same category perform so differently. The degradation of colection efficiency by aerosol loading was also investigated. Some filtering facepieces of a higher performance category are made up of several layers of the same material used for a lower category filtering facepiece. This paper have investigated the cumulative effect of multiple filtration layers on pressure drop and filtration efficiency</subfield>
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      <subfield code="a">American Industrial Hygiene Association journal</subfield>
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      <subfield code="t">American Industrial Hygiene Association journal</subfield>
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      <subfield code="g">Vol. 54, nº 2, February 1993 ; p. 51-60</subfield>
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