I am remember some times decades ago when turning a fume hood on was a novel act. After a generation or more of folks storing stuff at room temp in any lab with or without ventilation the advent of fume hoods was novel and most welcome. Internecine warfare at times.

Comments from others in the "elder generations".

> On 08/31/2021 9:53 AM Richard Palluzi <000006c59248530b-dmarc-request**At_Symbol_Here**lists.princeton.edu> wrote:
>
>
> Remember though that NFPA 45 recommends you never let it go below 4 ACH even when unoccupied off hours.
>
> And, to add to your comment, I remember saving a lot by simply training our security guards to close any open hood doors that they found during their tours after 7 PM. And record the hood location so the PI could get a gentle - and then not so gentle - reminder until it became a habit.
>
> Richard Palluzi
> PE, CSP,FAIChE
>
> Pilot plant and laboratory consulting, safety, design, reviews, and training
> www.linkedin.com/in/richardppalluzillc/
>
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>
> -----Original Message-----
> From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Ralph Stuart
> Sent: Tuesday, August 31, 2021 10:43 AM
> To: DCHAS-L**At_Symbol_Here**Princeton.EDU
> Subject: Re: [DCHAS-L] Fume hood article of interest
>
> > >Putting 58 fume hoods to sleep while unused results in substantial energy savings.
>
> Sometime I long for my days in the labs when fume hoods had these things called "on/off switches"…
>
> - Ralph
>
> Ralph Stuart, CIH, CCHO
> ralph**At_Symbol_Here**rstuartcih.org
>
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