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Measuring the filtration performance of breathing system filters using sodium chloride particles* : apparatus

✍ Scribed by A. R. Wilkes

Publisher: John Wiley and Sons
Year: 2002
Tongue: English
Weight: 834 KB
Volume: 57
Category: Article
ISSN: 0003-2409
DOI: 10.1046/j.1365-2044.2002.02328.x

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✦ Synopsis

The filtration performance of 33 breathing system filters (nine pleated hydrophobic and 24 electrostatic filters) was measured using sodium chloride particles. The particles had a size distribution with a count median diameter of 0.07 µm and a geometric standard deviation not exceeding 1.83. The geometric mean penetration values ranged from 0.002 to 0.67% for the nine pleated hydrophobic filters and from 0.25 to 35% for the 24 electrostatic filters (p < 0.0001 for the difference between the two filter types). The filtration performance obtained when filters are challenged with either sodium chloride particles or microbes is compared and discussed.

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