< div style='font-family: Times New Roman; font-size: 12pt; color: #000000' >Michael,

Here's an idea, though it is not without risk*:  Cont act a reputable manufacturer, preferably one that also makes conventional f ume hoods, and see if they would recommend a ductless hood for your applica tion.  Labconco, for example, even has a "chemical assessment form" yo u can fill out on-line and submit, to see "if a ductless enclosure is right for your application."  They also sell conventional hoods, so hopeful ly they're not too vested in one approach over the other and will give you a straight answer.  If the folks who make these things don't think it' s a good idea, that should have some credibility with the higher-ups.
*The risk here being that they give their ductless product rave reviews a nd insist it's perfect for your situation.  Maybe don't use your real name when you contact them. : )

                                               Don

Dear Ms. Baum:

 

Thanks for the reply. I am with the majority a nd I am against using "ductless=" fume hoods (those hoods th at do not have exhaust to outside but contain an integral exhaust blower an d filters which do not require duct or venting to the outside).

< p class="MsoNormal"> 

Due to the cost factors I was ask ed by my company to gather information regarding these "ductless =" fume hoods and their possible use. So far the comments indicating the safety issues using these type of the hoods with hazardous chemicals. I am trying to gather enough information from experts to convince my superi ors against using these hoods.

 

 

Regards,

 

 < /p>

Michael

 

 

From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**l ist.uvm.edu] On Behalf Of Janet Baum
Sent: Wednesday, Sept ember 21, 2011 11:24 AM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: Re: [DCHAS-L] Fume Hoods

 

Dear Michael, Do you mean ductless fume hoods, i. e. recirculating air fume hoods? There's a huge difference in the IH capabi lities between "ductless" and "ducted" fume hoods, if both are installed co rrectly. There are many IH risks and QA/QC considerations in using ductless hoods. Do you have documented and compelling reasons to consider using duc tless hoods?

 

Janet Baum, DivCHAS

< p class="MsoNormal">On Wed, Sep 21, 2011 at 10:07 AM, Michael Hojjatie &l t;mhojjatie**At_Symbol_Here**tkine t.com> wrote:

Dear colleagues:

 

 

We are in the process of building a new Laboratory and c ontemplating 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, hydro gen sulfide and sulfur dioxide gases.

 

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

 

 

Thanks,

 

 

Michael Hojjatie, Ph.D.

R&D director, TKI

   < /span>

 

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