[ RadSafe ] Fume Hood Face Velocity Requirement Origin

[Johnston, Thomas]

Thank you again on RadSafe. This topic came up this week and I needed a
standard to reference for reporting to management.

Thomas P. Johnston
Radiation Safety Officer
New York Medical College
Valhalla, NY 10595
914-594-4448 office
914-594-3665 fax
914-557-5950 mobile
tom_johnston at nymc.edu

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Thomas Shelley
Sent: Thursday, October 19, 2006 11:53 AM
To: radsafe at radlab.nl
Subject: Re: [ RadSafe ] Fume Hood Face Velocity Requirement Origin

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
>open.
>
>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
>410-436-4852
>DSN: 584-4852
>
>
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