August 2013
Intermediate to advanced
406 pages
12h 45m
English
Content preview from Textiles for Industrial Applications
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316 Textiles for Industrial Applications
© 2008 Taylor & Francis Group, LLC
12.1.2.1.7 Particle Concentration Efciency
For the various grades of high-efciency air lters (HEPA, ULPA, etc.), par-
ticle concentration efciencies are measured and expressed in terms of differ-
ences between upstream and downstream concentrations of submicrometer
particles determined by continuous online monitoring. While the concept is
simple, the practical reality tends to be complex because of the sophisticated
technique and equipment required both to generate consistently suitable
aerosols and to determine the size, size distribution, and concentration of
the particles. Aerosol particles are variously solid or liquid and range from
almost monosized to heterogeneous ...
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