| About This Archive | | DCHAS-L 2015 Index | | DCHAS-L Yearly Index | |
Check out Safety Emporium for your N95, N99, and face shield needs.
|
Previous by Date: Subject: Re: [DCHAS-L] Fume hood face velocities Date: Tuesday, June 30, 2015 12:45:28 PM Author: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**keene.edu> |
Next by Date: Subject: Re: [DCHAS-L] Fume hood face velocities Date: Tue, 30 Jun 2015 17:58:22 +0000 Author: Wayne Wood |
In addition high velocities can create reverse air flow as the air passing your body creates turbulence that can pull contaminates from the hood. 100 FPM has been the most widely accepted target face velocity but within the past several years hoods have been designed to operate safely at lower speeds. ANSI recognizes velocities as low as 60FPM in some instances.
Your 200 FPM is high but may or may not perform for your conditions. You will need to do an ASHRAE 110 test to determine your hood performance.
Kurt Rindoks
VP Engineering and Product Development
Kewaunee Scientific
Sent from my iPhone
On Jun 30, 2015, at 12:29 PM, Dr Bob Hi Penny! In most cases, the BIG issue is how 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 Phone 910 332 4878 From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu] On Behalf Of Penny Manisco -- (909)6074217 Spam<https://antispam.roaringpenguin.com/canit/b.php?iOKEf9Uz&m=4c08c8eb9e33&t 150630&c=s> The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer, multimedia hand held device or phone service. Thank you.
Previous post | Top of Page | Next post
Director of Product and Technology Development
Flow Sciences Inc.
2025 Mercantile Drive
Leland, NC 28451
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
________________________________
Phish/Fraud<https://antispam.roaringpenguin.com/canit/b.php?iOKEf9Uz&m=4c08c8eb9e33&t 150630&c=p>
Not spam<https://antispam.roaringpenguin.com/canit/b.php?iOKEf9Uz&m=4c08c8eb9e33&t 150630&c=n>
Forget previous vote<https://antispam.roaringpenguin.com/canit/b.php?iOKEf9Uz&m=4c08c8eb9e33&t 150630&c=f>