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Subject: Re: [DCHAS-L] Add a shelf in the fume hood

Date: May 12, 2018 20:07 UTC

Author: Harry Elston <helston**At_Symbol_Here**midwestchemsafety.com>

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Subject: Re: [DCHAS-L] Add a shelf in the fume hood

Date: May 12, 2018 21:05 UTC

Author: Robert Alaimo <rjalaimo**At_Symbol_Here**ATT.NET>

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From: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>

Subject: Re: [DCHAS-L] Add a shelf in the fume hood

Date: May 12, 2018 21:05 UTC

Reply-To: ACS Division of Chemical Health and Safety

In-Reply-To:  

Demystify: 

Thank you, Harry.  I'm slamming my # 9's down next to your feet.  We design these hoods and come back a year or two later and see things done that defeat the purpose.  If a hood is to be modified, the only it should be done is to have a consulting industrial ventilation engineer do the modification.  

Monona Rossol, M.S., M.F.A., Industrial Hygienist
President:  Arts, Crafts & Theater Safety, Inc.
Safety Officer: Local USA829, IATSE
181 Thompson St., #23
New York, NY 10012     212-777-0062
actsnyc**At_Symbol_Here**cs.com   www.artscraftstheatersafety.org

 


-----Original Message-----
From: Harry Elston <helston**At_Symbol_Here**MIDWESTCHEMSAFETY.COM>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Sat, May 12, 2018 4:54 pm
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 <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> 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