Air purifying filter systems for building air supply and respirators useful against NBC attacks
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United States of America Patent
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Jan 11, 2005
Grant Date -
Dec 23, 2004
app pub date -
Feb 21, 2003
filing date -
Feb 22, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An air filter that can fit within existing building HVAC air supply systems suitable for withstanding NBC attacks, comprising a series of pleated composite layers. By using impregnated carbon particles of the proper size, nerve gases, and gases of lower molecular weight, such as cyanogen chloride, are effectively controlled, even under tests simulating large-scale attacks. A particulate filter such as, for example, a HEPA filter, may be included to control biological particles or toxic aerosol droplets. The complete filter operates at such a low differential pressure, that existing building mechanicals do not have to be upgraded or replaced. Also disclosed is a filter for use with a respirator.
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