[ RadSafe ] Fume Hood Face Velocity Requirement Origin

[Falo, Gerald A Dr KADIX]

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
 
 
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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