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Previous by Date: Subject: Re: [DCHAS-L] Operating a fume hood w/Sash Height 15 inches max... Date: Friday, November 16, 2018 at 2:35:42 PM Author: Yung Morgan <pmorgan**At_Symbol_Here**EHS.UMASS.EDU> |
Next by Date: Subject: Re: [DCHAS-L] Operating a fume hood w/Sash Height 15 inches max... Date: Fri, 16 Nov 2018 21:41:34 +0000 Author: "Glode, Andy" |
All:
I not only agree a
good CV hood is just fine at 15" opening in the velocity range mentioned below, I would add that CV techniques used with a
good hood appear to save most of the exhaust air that VAV technologies can save with a lot less capital investment. Check the I2SL minutes for my paper "Low Hanging Fruit" for review of the thinking on this. I'll also forward you the paper if you contact
me.
One caveat emptor: The lower the CFM, the fewer cavity air changes. Watch out for high heat or acid digestions!
Dr. Bob Haugen
Director of Product and Technology Development
Flow Sciences, Inc.
910 332 4878
From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU]
On Behalf Of Yung Morgan
Sent: Friday, November 16, 2018 2:36 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Operating a fume hood w/Sash Height 15 inches max...
Margaret,
My 2 cents. Many years of testing fume hoods taught me that constant volume hoods are perfectly safe to use at 15 inch sash height at 80-120 FPM . Train the
users to use it at that height or lower and put a piece of colorful tape to delineate 6 inches inside the hood surface, in the case it does not have a proper air foil. If the room does not have supply air, you may have a hard time opening the door when the
hood is running. Give me the hood manufacturer name if you have and I can track it down for you .
Best Regards
Yung Morgan, Lab safety and IH officer
EHS 117 Draper hall
U of Mass
413-658-7467
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
On Behalf Of Margaret Rakas
Sent: Friday, November 16, 2018 12:12 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] Operating a fume hood w/Sash Height 15 inches max...
hi,
I wanted to check whether there are any health and safety concerns or any 'lessons learned' that would preclude using a continuous volume fume hood with a maximum sash height of 15 inches (rather than 18) if it passed ASHRAE 110 testing
and had an average face velocity between 80-120 fpm. We would train users regarding why the sash has to be at the 15 inches and there would be a sticker indicating maximum sash height. It is the sole fume hood in a lab, and would be used for mixing aqueous
acidic solutions and dissolving rocks rather than complicated organic chemistry setups...I realize manufacturer's specifications are likely 18 inches (this is an old fume hood, probably from the 1980's) so looking up documentation on this is probably not going
to be possible and might not be helpful, anyway.
A renovation several years ago turns out to have futzed the ventilation in this room; we're planning another renovation in the next year or so, but in the meantime it would be great to be able to use this fume hood if there are no regulations/guidance
which would indicate it should not be used.
Many thanks,
Margaret
--
Margaret A. Rakas, Ph.D.
Manager, Inventory & Regulatory Affairs
Clark Science Center
413-585-3877 (p)
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--- 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
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