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,
Michael A. Buczynski
Director Regulatory Compliance
RB (Reckitt Benckiser)
399 Interpace Parkway
Parsippany, NJ USA 07054-0225
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
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.
Chemical Hygiene Officer
Harvey Mudd College
P Please Consider the Environment before printing this Email
This email was sent from within RB plc the trading name of Reckitt Benckiser Group plc group of companies (http://www.reccol.com)This email (and any attachments or hyperlinks within it) may contain information that is confidential, legally privileged or otherwise protected from disclosure. If you are not the intended recipient of this email, you are not entitled to use, disclose, distribute, copy, print, disseminate or rely on this email in any way. If you have received this email in error, please notify the sender immediately by telephone or email and destroy it, and all copies of it.
We have taken steps to ensure that this email (and any attachments) are free from computer viruses and the like. However, it is the recipient's responsibility to ensure that it is actually virus free. Any emails that you send to us may be monitored for the purposes of ascertaining whether the communication complies with the law and our policies.
Previous post | Top of Page | Next post