As this discussion seems to be winding down, I thought I should make a
couple points before folks start writing policies.

First; Hoods are designed to operate effectively when stuff is placed in
them. That's the whole point of hoods. I don't see anyone suggesting
that airflow experts be consulted every time someone works in a hood.

Second; Whether or not stuff is left in the hood when work is not being
performed makes *zero* difference in airflow when work is being done.

So, unless you are willing to set policies regarding the placement and
nature of items put in hoods on a temporary basis, it makes no sense to
regulate permanent fixtures.

Dave Lane
Principal
Clavis Technology Development

On 14/5/18 6:32 AM, Fu, Zhen wrote:
> Harry,
> Thank you for your suggestion. Adding a permanent installations is definitely not allowed in this case. ASHRAE confirmation of results would be requested on the responsibility of the lab (if PI insisted). I will further talk to the PI today.
>
> Thank you,
>
> Zhen Fu, Senior Safety Specialist
>
> From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Harry Elston
> Sent: Saturday, May 12, 2018 3:08 PM
> To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
> Subject: Re: [DCHAS-L] Add a shelf in the fume hood
>
> The short answer is, "No - never." Hoods are instruments that are designed with flow in mind. Adding permanent installations is akin to a chemist making permanent changes to the baffles, fan blade rate or blocking off room supply because he/she doesn't like the way it sounds/feels/whatever.
>
> I don't say "no" often, but this is one time where I would absolutely put my foot down. (I MAY consider a qualified maybe if the user can prove to me that the hood will operate efficiently and provide the same level of protection to the user as if they shelf is not there. However, that takes a pretty hefty study.)
>
> Harry
>
> From: ACS Division of Chemical Health and Safety > On Behalf Of Kennedy, Sheila
> Sent: Saturday, May 12, 2018 1:13 PM
> To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
> Subject: Re: [DCHAS-L] Add a shelf in the fume hood
>
> I'd really appreciate information from anyone who has placed such shelves for materials in continuous use. What materials? What height for ventilation? What else to consider?
> Sheila Kennedy
> Safety Coordinator
> CHEM Teaching Labs
> UC San Diego
>
> ________________________________
> From: ACS Division of Chemical Health and Safety > on behalf of Ellen M. Sweet >
> Sent: Saturday, May 12, 2018 9:19:48 AM
> To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
> Subject: Re: [DCHAS-L] Add a shelf in the fume hood for H&E staining
>
> Hi Zhen,
> It is typical in Histology labs to keep the staining glassware/ troughs right in the hood. I've seen a shelf placed in the back so that these can be raised in order to not block the baffle and also free up bench space in the hood for other work.
>
> I would suggest asking how frequently they are used, however, because the dishes and jars with glass lids do not seal and the liquids will evaporate. If they are, essentially, in constant use, then they really aren't being left there endlessly. Cleaning everything up only to pull it all back out the next day would get annoying.
>
> I hope this helps,
> Ellen
>
>
> Ellen Sweet
> Laboratory Ventilation Specialist
> Department of Environmental Health and Safety, Cornell University
> American Chemical Society, Division of Chemical Health and Safety
> 315-730-8896
>
>
> From: ACS Division of Chemical Health and Safety > On Behalf Of Fu, Zhen
> Sent: Friday, May 11, 2018 10:03 AM
> To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
> Subject: [DCHAS-L] Add a shelf in the fume hood for H&E staining
>
> Good morning,
>
> We recently have a lab doing Hematoxylin and Eosin (H&E) staining contacted us to add a shelf in the fume hood to "store" the histology troughs (which includes ethanols at different concentrations, xylene, hemotoxylin, eosin).
> The PI insisted this is a common procedure in histology labs and the solely purpose of this shelf is for this experiment.
>>From EHS and Fire code side, No chemical storage in fume hood (only notable exception being some toxic gases in lecture bottles). In code this applies to flammable liquids.
>
> Any experience or comment can share with me regarding the best practice for this case. Thank you very much.
>
> Best,
>
> Zhen
>
>
> --- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
> --- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
> --- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
> --- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
>
> ---
> For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org
> Follow us on Twitter **At_Symbol_Here**acsdchas
>

---
For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org
Follow us on Twitter **At_Symbol_Here**acsdchas

Previous post   |  Top of Page   |   Next post