Date: Wed, 21 Sep 2011 21:42:27 -0400
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: Peter Zavon <pzavon**At_Symbol_Here**ROCHESTER.RR.COM>
Subject: Re: Fume Hoods
In-Reply-To: <B06FE04AACB936438D57258499897CD91630D6DA6F**At_Symbol_Here**>

With the materials you list as intended for current use, I would never accept a recirculating hood.
However, there is one other issue to consider in addition to all the points already mentioned on this topic.  Even if you have ductless hoods for low hazard uses, which would be the only really acceptable application in my opinion, how confident can you be that a change next month, next year, or in five years will not result in the use of other materials, not really suitable for use in a recirculating hood? It is hard enough in industrial labs to ensure that a hood in not improperly applied that way. In my opinion, in academia it is virtually impossible.
I don't believe that lab buildings should be designed so narrowly that only a limited number of very specific items are suitable for use in the lab without major renovation.  Plan for the unknown future, or at least to permit its arrival, without the need to completely rework your physical plant.

Peter Zavon, CIH
Penfield, NY


From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**] On Behalf Of Michael Hojjatie
Sent: Wednesday, September 21, 2011 11:08 AM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [DCHAS-L] Fume Hoods

Dear colleagues:

We are in the process of building a new Laboratory and contemplating between using Dustless Fume Hoods vs. Ducted Exhaust Hoods. We will be using a variety of hazardous chemicals including carbon disulfide, acetonitrile, toluene, benzene, some carcinogenic suspect chemicals, hydrogen sulfide and sulfur dioxide gases.

I appreciate sharing your experiences with ductless fume hoods and whether you recommend these type of hoods for hazardous chemical work using the aforementioned chemical examples as well as advantages and disadvantages of these hoods vs. the ducted exhaust hoods (safety concerns, costs, maintenance, etc.)


Michael Hojjatie, Ph.D.

R&D director, TKI


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