Date: Wed, 15 Apr 2009 16:34:23 -0400
Reply-To: Ed Miller <MILLEREJ**At_Symbol_Here**PLATTSBURGH.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Ed Miller <MILLEREJ**At_Symbol_Here**PLATTSBURGH.EDU>
Subject: Fume Hoods

  We recently designed a science building and expect ground breaking in t
next two months.  Hoods were a key piece of the design since we are tryin
to get the new building energy certified and we also had to meet NY state
mandates for energy savings.
  We decided in conjunction with the SUNY Construction Fund Engineers and
our EH&S Officer to go with High Efficiency Variable Air Supply Hoods
.  As I 
understand it, the air flow into the hood varries with the sash opening. 
 It also 
uses a different containment approach with vortex creation as opposed to 

laminar flow across the face.  The hoods will be installed with both vert
ical and 
horizontal sashes to minimize the amount of open face.
  In terms of our processes, we decided to forgo using high hazard materi
als in 
the hoods so that the hoods could be combined into a few plenums with hea
exchnagers.  Otherwise, each hood would have to had its own ducting and n
heat exchangers.  That is code in NY State.  This required us to revisit 
we did certain experiments with bromine and HF.  Also, we decided that an
experiments with perchloric acid would be rengineered.  This allowed us t
avoid the issues with special systems for washing hood ducts for hoods wh
perchloric acid has been used.
  We visited sites where these hoods were installed and were satisfied wi
their operation. I'd be interested to hear how people keep high hazardous
materials contained when they are working with them in a hood system.

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