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**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