Date: Thu, 19 Nov 2009 16:12:51 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Edward Senkbeil <egsenkbeil**At_Symbol_Here**SALISBURY.EDU>
Subject: Hoods
In-Reply-To: <114A3B4A298A4626867825B647FEA486**At_Symbol_Here**chemical6df00a>
The hoods (about 5 years old) in all our undergraduate chemistry labs are 
equipped with alarms which supposedly should go off with improper air 
flow.  However many will continually alarm if the sash is pulled up by 
more than one third the way (below where sash has a normal catch about 
half way up).

Is there any law / regulation which states that we must have the alarms 
working if they are part of the original equipment?  All the hoods have 
flow gauges on them which are functioning, but we have been unable to get 
all the alarms to work properly.  We are told it would be very expensive 
to get them all functioning.  They become a problem in large student labs 
since they continually go off, and are distracting both faculty and 

We have considered disarming the alarm, but are concerned about any 
regulations we might be violating.
Students are beginning to not pay attention to the flow gauges, but just 
automatically hit the mute button on the alarms.  We believe the flow 
gauges are a more accurate reflection of any problems.

Any comments or suggestions welcome.

Ed Senkbeil, Ph.D.
Chemistry Department
Salisbury University

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