Date: Thu, 15 Dec 2011 04:37:35 -0500
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From: JAKSAFETY**At_Symbol_Here**AOL.COM
Subject: Re: Perchloric Acid Hood Duct Design Criteria
X-To: dchas-l**At_Symbol_Here**med.cornell.edu

My understanding is the it should not be less than 70 degrees and pref.erably vertical 
 
James A. Kaufman, Ph.D.
Chair, ICASE Committee on Safety in Science Education
International Council for Associations of Science Educationwww.icaseonline.net

President/CEO

The Laboratory Safety Institute (LSI)

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Safety in Science and Science Education

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jim**At_Symbol_Here**labsafetyinstitute.org www.labsafetyinstitute.org

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In a message dated 12/14/2011 3:36:53 P.M. Eastern Standard Time, ldmclouth**At_Symbol_Here**LBL.GOV writes:
Hi All -

Is anyone aware of a prohibition against using 45 degree angle ductwork
runs (as opposed to vertical runs) for a perchloric acid fume hood? 
This pertains to water washdown systems.  This question was posed to me
and I thought I'd seek your collective wisdom.
aware of regarding this subject.

Regards

Larry

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