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Previous by Date: Subject: Re: [DCHAS-L] Fume hood face velocities Date: Tuesday, June 30, 2015 12:27:56 PM Author: Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM> |
Next by Date: Subject: Re: [DCHAS-L] Fume hood face velocities Date: Tue, 30 Jun 2015 16:45:28 +0000 Author: "Stuart, Ralph" |
Penny ,
Check the ACGIH Vent Guide for a numbered plate (Drawing) for laboratory hoods. I believe somewhere in th range of 70-100 fpm is the recommendation. As you know the hood sash should be pulled down quite far so as to protect the chemist, usually within a few inches. Our R&D labs pulled the sash down and placed an arrow on the side to indicate where 100fpm was measured. If you have some sort of mixing where you have a very volatile solvent solution and do not want the solvent to evaporate, I have seen as low as 25fpm for this procedure. Hope this helps,
Mike
Michael A. Buczynski
Director Regulatory Compliance
North America
RB (Reckitt Benckiser)
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Parsippany, NJ USA 07054-0225
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Please think before you print.
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu]On Behalf Of Penny Manisco
Sent: Tuesday, June 30, 2015 11:55 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] Fume hood face velocities
Hello,
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
(909)6074217
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