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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: BirdDog who wrote (6031)	10/18/2001 3:40:20 PM
From: Win Smith	Respond to of 281500

Experts Say Spores Won't Spread in Ventilation System nytimes.com I don't know about vacuum cleaners, but unless you're newsworthy it's not clear there's much of a threat at home. On the broader issue, this article covers a lot of bases. To become infected with inhalational anthrax, the deadliest form of the disease, a person would have to inhale 8,000 to 10,000 spores no larger than about five microns. The filters in the systems of newer office buildings should remove about 90 percent of particles of that size in a single pass, said Mr. Woods, of the heating engineers' society. More advanced filters, called HEPA for high-efficiency particulate air filter, take out at least 99.97 percent of such particles in a single pass, Mr. Woods said. But those filters are often 5 to 10 times as expensive and require more powerful air- circulation systems, and so are not used in many buildings. Officials refused to comment on the ventilation systems used in federal buildings in Washington.