From: Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM>
Subject: Re: [DCHAS-L] Fume hood face velocities
Date: Tue, 30 Jun 2015 16:27:56 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 7B39633B01F4EE42A269E983C42F5A48060D0F7E**At_Symbol_Here**SULFATE.fsidomain.local

Hi Penny!


In most cases, the BIG issue ishow much energy it costs to exhaust all this conditioned air.  (~ $10 to $15 per CFM per year in most localities)  The older, square side post hoods with no airfoil are the most likely to produce nasty turbulence as well.  Please call me if questions.


Very Truly Yours,


Dr. Bob Haugen

Director of Product and Technology Development

Flow Sciences Inc.

2025 Mercantile Drive

Leland, NC 28451


Phone 910 332 4878


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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