Determinations of known respirator leakage using controlled negative pressure and ambient aerosol QNFT systems

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      <subfield code="a">This study was not designed as a direct comparison of fit-factor measurements made with controlled negative pressure (CNP) and ambient aerosol fit-test systems. The study was designed to determine how well each system could measure a known source of leakage introduced into a subject's respirator</subfield>
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      <subfield code="g">Vol. 56, nº 1, January 1995 ; p. 16-23</subfield>
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