Date: Fri, 9 May 2003 08:18:01 -0400
Reply-To: "Ralph Stuart, University of Vermont" <rstuart**At_Symbol_Here**>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Ralph Stuart, University of Vermont" <rstuart**At_Symbol_Here**>
Subject: Fume hood face velocity question.

Please reply directly to Mary. Replies sent to the list address will
be re-directed to her.

- Ralph

Subject: RE: CHEMICAL HEALTH AND SAFETY has been updated on
Date: Thu, 8 May 2003 11:41:29 -0500
From: "Prisby, Mary" 

I would like to get some assistance with a project I am working on.
I am currently evaluating our fume hood operating conditions to
maintain a safe work environment but reduce energy consumption.  I am
sure we have all been in a situation of evaluating cost reduction
without impacting safety.  IH monitoring has been completed
periodically and the results have come back as nondetect. Projects
are not consistent.  The work consists of small scale chemical
synthesis work to 200 liter reactors.

Our current face velocities are at 100 fpm.  The fume hoods do have a
set back at 60fpm.  I am putting together data to support reducing
the face velocities down to 80 or 90 fpm to lower energy cost.  Of
course I would complete additional IH monitoring.  I would like to
see if other companies or institutions have completed similar
activities.  I am also interested in any reference material that
discusses energy consumption.  I am currently using the specs from
the fume hood manufacturer, Industrial Ventilation Manual and have
requested Ventilation for Control of the Work Environment among other

As an fyi, in addition to using fume hoods, safety evaluations may
recommend use of a respirator as additional protection when handling
highly toxic materials.


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