[ RadSafe ] Fume Hood Face Velocity Requirement Origin

Thomas Shelley tjs1 at cornell.edu
Thu Oct 19 10:52:56 CDT 2006

Dear RadSafe--This is now considered antiquated as a standard, even for rad 
work.  Look at ANSI/AIHA Z9.5--2003 for fume hood face velocity 
criteria.  We are using 100 linear feet per minute at 18 inches as a 
standard criteria.  This is now pretty much an industry standard.  Please 
contact me if you are interested in more details.   Tom

At 08:43 AM 10/19/2006 -0400, you wrote:
>Good morning all,
>I was asked to look into the recommended face velocity for fume hoods of
>125 linear feet per minute (lfpm).  Specifically, I am looking for the
>origin of this recommendation, if there is any regulation requiring this
>face velocity, and measurement protocol/requirements.  I have Shapiro's
>text (4th edition) that does cite the 125 lfpm but doesn't give the
>source nor measurement protocols.  My colleagues and I assume that the
>measurements should be made with the hood sash open about 30 - 40 cm,
>although I've heard about measurements being made with the hood fully
>Any leads would be greatly appreciated.
>Jerry Falo
>The statements and opinions expressed herein are my responsibility; no
>one else (certainly not my employer) is responsible, but I still reserve
>the right to make mistakes.
>Don't panic! - Douglas Adams in "The Hitchhiker's Guide to the Galaxy"
>Gerald A. Falo, Ph.D., CHP
>Kadix Systems
>U.S. Army Center for Health Promotion and Preventive Medicine - Health
>Physics Program
>jerry.falo at us.army.mil
>DSN: 584-4852
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