From: William Hebel <whebel**At_Symbol_Here**WHEBEL.COM>
Subject: Re: [DCHAS-L] Ductless fumehoods or Not.
Date: Wed, 19 Mar 2014 00:37:22 -0500
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: CAKxpEJUod4opO1JKpQB4q-OooXdKiaRp0ybnpdRGOZa5quo1-Q**At_Symbol_Here**
In-Reply-To <69881DF9-8297-4595-A563-78CA5987C952**At_Symbol_Here**>

I think, given the choice, I would much rather rely on a fully ducted chemical fume hood rather than the activated carbon filter of a ductless system. It seems that there are a lot of questions to answer about ductless systems and your operations before purchase. What is the service life of the filtration bank and how much does it cost to replace, if possible? What will the volume of work be? Given that a ductless system recirculates the air back into the room, can that pose any safety risks that can be eliminated by the installation of a ducted system? Just a few things that come to mind. I hope it helps.

William Hebel
Biosafety Technician

On Tue, Mar 18, 2014 at 5:59 PM, Richard W. Denton <rwdenton3**At_Symbol_Here**> wrote:
Hi everyone:
I was asked by my department to assist in deciding whether to purchase ductless fumehoods for our undergraduate chemistry labs. We are planning to use these for flammable solvents, and reactions involving HCl and NaOH. These hoods will be used by undergraduates for research also. Any input on the safety issues involved with these equipments versus the regular hoods would be appreciated.
-Richard (CHO)

William Hebel

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