From: "Rindoks, Kurt" <KurtRindoks**At_Symbol_Here**KEWAUNEE.COM>
Subject: Re: [DCHAS-L] Fume hood face velocities
Date: Tue, 30 Jun 2015 13:01:24 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: B812F81F-8744-47DA-B429-B47A8EC72CAD**At_Symbol_Here**
In-Reply-To <7B39633B01F4EE42A269E983C42F5A48060D0F7E**At_Symbol_Here**SULFATE.fsidomain.local>

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 > wrote:

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
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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