In addition, such panels will likely have greater affect when a user is standing at and working in the hood, particularly in the corners which are already the most common problem area. Under normal circumstances, simple static tests when unattended are of limited practical value, and I personally wouldn’t be comfortable with applying the same assumptions when airflow is also blocked from one side. A body in the middle and panel on the end will create a new air corridor that may lead to turbulence. If it passes a straight average face velocity test, scrutinize the end again with someone standing in position, and with smoke while they are moving.

 

 

 

Hoods draw their supply air from the room. So installing panels like this is very likely to affect the face velocities near the edges of the hoods. The only way to really know is to install some and ask a balancing firm to come in and test the hoods per the ASHRAE 110 face velocity protocol before and after they are installed. If you obtain your desired average face velocity in both tests you are fine. (My experience says you have, at best, a 50/50 chance.) You could also do the ASHRAE 110 tracer gas test but that is a lot more expensive and more open to interpretation.

 

 

 

Good morning all,

 

I have 2 4-ft hoods directly next to each other. My dean would like to get a vertical acrylic divider to put between them. He does not want to damage the hoods in any way so this divider would have to be magnetized or hang from the top somehow. He would like proof that this does not impede the air flow in the room. Does anyone have any ideas of how to go about acquiring said proof? What companies do these type of studies? The folks who install and calibrate the hoods?

 

And, is anyone else using such a thing? Or are you allowing people to work next to each other (within 4 ft) for a 3-hour lab? Or eliminating every other hood?

 

Thanks much.

Rose

 

 

Rose Rakers, Ph.D.

Director of Chemical Laboratories and Chemical Hygiene Officer

Department of Physical Sciences/College of Science

Birck Hall, Room 118

5700 College Rd.  l  Lisle, IL 60532

Office: (630) 829-6571

ben.edu

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