Date: Wed, 21 Sep 2011 13:23:52 -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: Janet Baum <baum.janet**At_Symbol_Here**GMAIL.COM>
Subject: Re: Fume Hoods
In-Reply-To: <B06FE04AACB936438D57258499897CD91630D6DA6F**At_Symbol_Here**phxe2k7.tusa.tkinet.com>

Dear Michael, Do you mean *ductless* fume hoods, i.e. recirculating air fume hoods? There's a huge difference in the IH capabilities between "ductless" and "ducted" fume hoods, if both are installed correctly. There are many IH risks and QA/QC considerations in using ductless hoods. Do you have documented and compelling reasons to consider using ductless hoods? Janet Baum, DivCHAS On Wed, Sep 21, 2011 at 10:07 AM, Michael Hojjatie wrote: > 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.) **** > > ** ** > > ** ** > > Thanks,**** > > ** ** > > ** ** > > Michael Hojjatie, Ph.D.**** > > R&D director, TKI**** > > **** >

Dear Michael, Do you mean ductless fume hoods, i.e. recirculating ai r fume hoods? There's a huge difference in the IH capabilities between "ductless" and "ducted" fume hoods, if both are install ed correctly. There are many IH risks and QA/QC considerations in using duc tless hoods. Do you have documented and compelling reasons to consider usin g ductless hoods?


Janet Baum, DivCHAS

On Wed , Sep 21, 2011 at 10:07 AM, Michael Hojjatie <mhojjatie**At_Symbol_Here**tkinet.com> wrote:

Dear colleagues:

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

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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 d isadvantages of these hoods vs. the ducted exhaust hoods (safety concerns, costs, maintenance, etc.)

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Thanks,

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Michael Hojjatie, Ph.D.< /u>

R& ;D director, TKI

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