From: Wayne Wood <wayne.wood**At_Symbol_Here**MCGILL.CA>
Subject: Re: [DCHAS-L] Fume hood face velocities
Date: Tue, 30 Jun 2015 17:58:22 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 4F21A5F3A002444D8B4F5E4B767431E5A09068AC**At_Symbol_Here**exmbx2010-8.campus.MCGILL.CA
In-Reply-To <14AAD9DC657DF948AE6AC4668C623653849EF5BA**At_Symbol_Here**>

As another poster mentioned, the ASHRAE 110 test is the most reliable way to determine if the hood is containing properly, but before you spend all that money a simple test with a smoke pencil may be enough to demonstrate there is a problem with turbulace-induced leakage and that you need to lower the velocity.  If I were to do the ASHRAE test, I would wait and do it after the modifications to make sure I was presenting the client with a reliable hood.   




Wayne Wood | Environmental Health and Safety |McGill University | 3610 rue McTavish Street, 4th floor | Montreal, Quebec, Canada, H3A 1Y2 | Tel: (514) 398-2391



From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**]On Behalf Of Penny Manisco
Sent: Tuesday, June 30, 2015 11:55 AM
Subject: [DCHAS-L] Fume hood face velocities



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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