Please feel free to give me a call. A lot depends on what type systems they are surviving. (So it you have three separate systems (a usually bad design) you would usually use 3 thermostats unless someone was smart enough to realize that they need to do it with just one which requires some design work.)
I don't know of any standard they tells you where to place them, just a lot of guidelines. And I'd ask if you have large temperature differentials in the lab. Most times you won't due to the high turnover. And if you don't who really cares where they placed them however strange it seems.
Richard Palluzi
PE, CSP
Pilot plant and laboratory consulting, safety, design,reviews, and training
www.linkedin.com/in/richardppalluzillc/
Richard P Palluzi LLC
72 Summit Drive
Basking Ridge, NJ 07920
rpalluzi**At_Symbol_Here**verizon.net
908-285-3782
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Michael Schaffer
Sent: Saturday, March 28, 2020 2:52 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Article
I have a question.
We recently remodeled our lab.
Had a ton of HVAC problems during and after construction.
Getting through them but very painful and expensive.
One of the issues was in the 4 lab areas, they installed up to three thermostats on the same wall within inches of each other!!!
We fought with the mechanical electrical engineers.
I dont know where to look to establish proper placement and force them to move them as the rooms are large and full of equipment.
Is there a standard practice?
Michael I. Schaffer, Ph.D., F.A.B.F.T., NRCC-TC
VP Laboratory Operations
Psychemedics Corporation
5832 Uplander Way
Culver City, CA 90230
310-216-7776 (phone)
310-216-6662 (Fax)
(800) 522-7424 (toll free) Extension 140
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Richard, Brilliant and very clearly written. I would only argue with the very first line which is:
"Laboratory ventilation is very different from commercial and industrial systems.
While I agree that lab ventilation is very different from commercial, heating and air-conditioning ventilation, I do not agree that it is different from industrial ventilation. Lab ventilation is industrial ventilation. I have a problem with the heating and air-conditioning standards being used when there is a better code developed by the American Conference of Governmental Industrial Hygienists (ACGIH) which should be used instead.
Every problem you describe is exactly the same problem in industrial ventilation design. I can't speak for large industrial systems for refineries and major manufacturing, but I know they are identical for: wood shops; foundries; welding and metal working shops; sculpture, ceramic, and fine art studios; and theatrical scene, prop, and costume shops. Now we are seeing the same problems in the new fab labs which are full of 3D printers, CNC routers, laser cutters, water jet cutters, and other new technology.
And I love the picture which could be titled "how not to design a canopy hood."
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