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Subject: Re: Fume Hoods
Date: Wed, 21 Sep 2011 11:20:37 -0400
Author: Don Abramowitz
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Subject: Re: Fume Hoods
Date: Wed, 21 Sep 2011 13:23:52 -0500
Author: Janet Baum
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Date: Wed, 21 Sep 2011 12:07:01 -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: "Clark, Richard C" <rcclark**At_Symbol_Here**BEMIS.COM>
Subject: Re: Fume Hoods
In-Reply-To: <B06FE04AACB936438D57258499897CD91630D6DA6F**At_Symbol_Here**phxe2k7.tusa.tkinet.com>
Michael:
A concern that your lab designers
will be bringing to the table is how the ducted hoods will upset the HVAC.
Certainly, planning HVAC for ductless hoods
is much simpler (and cheaper). However, the reasons given by others
about the inadequacies of ductless hoods can't be minimized.
The building airflow must not onl
y accommodate the draw of the ducted hoods, but it also must compensate for
the outside temperature (your climate). I
highly recommend a remote source of make-up air rather than a hood that su
pplies its own make-up air from outside. The inline heaters are never
good enough to compensate for truly cold temperatures and incoming hot air
will be most uncomfortable as well as
ruining any temperature-controlled processes in the hoods. Finally,
the makeup air design should also compensate for door openings and closings
. Opening and closing a door shouldn't disrupt the hood face velocity
. Be alert to these issues and make sure
they are part of the design; local HVAC engineers rarely design laboratori
es and they will sweep these issues under the carpet.
Richard Clark
Sr. Research Chemist
Bemis Innovation Cente
r
Neenah, WI 54956
From: DCHAS-L Discussion List [mail
to:DCHAS-L**At_Symbol_Here**list.uvm.edu]
On Behalf Of Michael Hojjatie
Sent: Wednesday, September 21, 2011 10:08 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 La
boratory and contemplating between using Dustless Fume Hoods vs. Ducted Exh
aust Hoods. We will be using a variety
of hazardous chemicals including carbon disulfide, acetonitrile, toluene,
benzene, some carcinogenic suspect chemicals, hydrogen sulfide and sulfur d
ioxide gases.
I appreciate sharing your experiences with
ductless fume hoods and whether you recommend these type of hoods for haza
rdous chemical work using the aforementioned
chemical examples as well as advantages and disadvantages of these hoods v
s. the ducted exhaust hoods (safety concerns, costs, maintenance, etc.)
Thanks,
Michael Hojjatie, Ph.D.<
/p>
R&D director, TKI
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