We recommend they use the sashes as low (or narrow) as possible and still work. In all cases, the fumehoods should not be used with vapors being generated when the sashes above the point were they are marked to operate at 100 fpm We first test at full-open, if the fume hood draws at 100 fpm then that's where we mark it. If not, we lower it to 24 inches, then to 18 inches. If it doesn't 'pass' at 18" we put in a work order to get the hood fixed. -Russ Russell Vernon, Ph.D. Laboratory / Research Safety Specialist Environmental Health & Safety University of California, Riverside 900 University Ave. Riverside, CA 92521 russell.vernon**At_Symbol_Here**ucr.edu www.ehs.ucr.edu Direct: (909) 827-5119, on 7/17/2004 area code becomes (951) Admin: (909) 827-5528 Fax: (909) 827-5122 -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU]On Behalf Of Gordon Miller Sent: Monday, May 03, 2004 1:16 PM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: Fume Hood Sash Settings Two dumb questions: 1. At what height do you advise hood users to set their sashes? 2. At what sash height do you test face velocities? Gordon Miller Lawrence Livermore National Laboratory P.O. Box 808 (L-379) Livermore, California 94550 (925) 423-8036 Fax (925) 422-5176 miller22**At_Symbol_Here**llnl.gov
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