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From: lmueller**At_Symbol_Here**vaccinex.com Date: March 31, 2006 3:44:45 PM EST I am looking for some guidelines regarding air changes required in laboratories where hazardous chemicals as well as recombinant DNA and bacteria are used on a laboratory/research scale. We currently have 21 air changes / hr, is it ok to scale back to 10? Thank you, Loretta Mueller Vaccinex Inc