Date: Wed, 12 Jul 2006 11:09:38 -0400
Reply-To: List Moderator <esf**At_Symbol_Here**UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: List Moderator <esf**At_Symbol_Here**UVM.EDU>
Subject: Re: Fume hood sashes

From: 	  info**At_Symbol_Here**
Subject: 	Re: [DCHAS-L] Fume hood sashes
Date: 	July 11, 2006 5:56:36 PM EDT

A good start is to put some chains on the wall nearest the fume hood  
so folks have a place to chain up their cylinders.  Some signs that  
say "Cylinders Must Be Chained At All Times" and "Cylinders Not  
Connected Must Be Capped" would be an added bonus.

Some folks are not capable of running (or have never considered how  
to run) gas in from a location more than 2 feet away from their  
apparatus.  Or they are lazy.  It's easy to set up a localized  
nitrogen manifold in the laboratory, for example, but it requires a  
modicum of acquired skill in selecting the appropriate fittings,  
tubing, and valves.  Or they might use a cylinder infrequently and  
running a "large" length of tubing seems inconvenient.  In addition,  
I suspect some folks fear the gases they work with (carbon monoxide,  
hydrogen) and therefore have an innate desire to have the whole  
shebang as close to the hood as possible in the event of a leak.

Folks make the fume hood airfoil modification for other reasons as  
well.  For example, in my former labs we had vacuum lines in the  
hoods and the pumps were underneath them.  We had to run the heavy  
wall tubing or copper pipe connecting these components under the hood  
sash.  If I didn't have a Dremel tool to cut a hole through the air  
foil we would have either had to run it over the top of air foil  
(meaning the sash would not close the last 1.25 inches) or remove the  
air foil....or possibly modify the sash with a spacer that allowed  
the tubing to fit.

So I wouldn't necessarily call it ignorance (although it comes down  
to that too often, alas).  It's just that some folks are not handy  
(or are not willing to be handy) with tools or design, and some  
schools are not good about supplying support personnel who can make  
simple improvements/adjustments such as these (one of those false  

If you had the time and money, a campaign to assist folks in making  
the necessary modifications for their unique situations might be  
worth the effort.  Wouldn't eliminate this problem, but it could  
reduce it.

Some heavy duty custom aluminized tags reading "This Air Foil Not To  
Be Removed or Modified...." might be a good part of such a program as  


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