From: Penny Manisco <pmanisco**At_Symbol_Here**G.HMC.EDU>
Subject: [DCHAS-L] Fume hood face velocities
Date: Tue, 30 Jun 2015 08:54:51 -0700
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: CADJGnynRwD4BW445JGOA4=sfXpZkesYuYW-SExgEPBhGQ8jfnQ**At_Symbol_Here**


Upon performing lab inspections I have noticed hoods that seem, in my opinion, to have excessively high face velocities when the hood sash is in an appropriate position for performance of tasks. These velocities exceed 200 f/m in some cases. I am concerned that this velocity causes unsafe air turbulence. Since OSHA sets no upper face velocity the hoods pass inspection. Any thoughts or citations would be appreciated.

Penny Manisco,
Chemical Hygiene Officer
Harvey Mudd College


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