Unless you are (1) going to remove all the hazardous materials from the areas not being ventilated, (20 prohibit occupancy for any easy until the ventilation system has been on for at least a few hours, and (3) Have had an expert review your specific climate situation to confirm there should be no credible potential for mold growth I would not turn off the hoods. And the analysis has to consider the stack effects as the hood ducts will draw in outside air.
When we say ventilation system, it can mean different things to different people. Normally I hear the term used to describe the exhaust system (hoods, local exhaust, general lab exhaust) and the supply air system (heating, cooling and fresh air. Some older systems do separate the hoods because they each have a dedicated fan (or a few share a fan).
I would close the hood doors turn down the exhaust and supply as much as possible but keep it at at least 4 ACH.
Richard Palluzi
PE, CSP
Pilot plant and laboratory consulting, safety, design,reviews, and training
www.linkedin.com/in/richardppalluzillc/
Richard P Palluzi LLC
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-----Original Message-----
From: ACS Division of Chemical Health and Safety On Behalf Of Eric Goff
Sent: Tuesday, March 31, 2020 9:01 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Hood shut downWhat about a facility where the hoods are tied into the ventilation system? The building will be shut for a considerable amount of time with the systems off.
Should hood sashes be closed?
Should we try to have building automation system (computerized) have the hoods run for a set period of time each week?
Thanks in advance!!!
On 31/03/2020, James Kaufman wrote:
> I have a copy of the article if anyone needs it. Hi name was Roland
> Daigle and he worked for Windsor Pharmaceutical in Nova Scotia.
>
> PS. "There's more to lab safety than just labs!"
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>
> *James A. Kaufman, Ph.D.*
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> On Mon, Mar 30, 2020 at 11:34 AM ILPI Support wrote:
>
>> 1. It‰??s a Bad Idea if there is any chance that anyone will be
>> performing work that requires a hood and is unaware of the shutdown
>> or chooses to ignore the shutdown. In 2009, a Canadian worker DIED
>> because he performed work with trimethylsilyldiazomomethane during a
>> fume hood shutdown. I can‰??t find an article that actually confirms
>> the cause of death:
>> https://www.cbc.ca/news/canada/nova-scotia/protective-fume-hoods-turned-off-before-lab-worker-s-death-1.798585
>> Likewise, workers may not be skilled or informed enough to
>> understand that a shut down hood provides no protection. At the very
>> least you would have to put huge signs on each hood and tape them
>> shut. But I still would not underestimate the will of a student
>> intent on finishing their dissertation etc. to bypass these signs
>> nonetheless.
>>
>> 2. Chemicals or waste stored in the hoods (yes, yes, we all know
>> about proper hood use vs. how they are actually used), may emit
>> vapors, develop a leak, or undergo a spontaneous reaction/explosion
>> that releases toxic or flammable vapors or liquids. A functioning
>> hood could prevent such releases.
>>
>> My writeup on fume hoods in the SDS HyperGlossary has various links
>> to fume hood/ventilation considerations:
>> http://www.ilpi.com/msds/ref/fumehood.html
>>
>> Rob Toreki
>>
>> ======================================================
>> Safety Emporium - Lab & Safety Supplies featuring brand names you
>> know and trust. Visit us at http://www.SafetyEmporium.com
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>> toll-free: (866) 326-5412
>> Fax: (856) 553-6154, PO Box 1003, Blackwood, NJ 08012
>>
>>
>>
>>
>> On Mar 30, 2020, at 10:59 AM, Dr. Joseph M. Crockett <
>> jcrocket**At_Symbol_Here**BRIDGEWATER.EDU> wrote:
>>
>> ‰??I've received the following from a colleague at another school.
>>
>> The powers that be want to save money by shutting down the hoods in
>> our building. That doesn‰??t seem like a good idea to me and I have
>> asked others and they agree, but no one can tell me why we shouldn‰??t
>> shut them down.
>> Do
>> you have any insights on this? Should I be concerned if all the hoods
>> get shut down? If so, why?‰??
>>
>> I agree with the department, not the PTB, but would like more
>> feedback
>>
>> Joe C
>>
>>
>> [image: BC Logo] *Joseph M Crockett*
>> *A LeRoy and Wanda H Baker Chair of Science* *Professor of Chemistry*
>> Department of Chemistry Bridgewater College
>> Phone: 540-828-5431 | bridgewater.edu <https://www.bridgewater.edu/>
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--
Best Regards,
-Eric
Eric W. Goff
Chemistry Educator
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