Our Fire Marshall’s policy, which I think is based on fire code, is to require that the supply and exhaust ports both be equipped with a fire arrestor to prevent a fire from jumping floors. An internet search
will locate them –Grainger is one supplier.
--------------------------------------------------------
Scott Goode, Professor
Department of Chemistry and Biochemistry
University of South Carolina
631 Sumter Street
Columbia SC 29208
Email: Goode**At_Symbol_Here**sc.edu
Phone: 803-777-2601
Fax: 803-777-9521
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU]
On Behalf Of Kohler, Christopher E
Sent: Monday, June 29, 2015 9:50 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] Vented flammables cabinets
Dear Listers,
Thanks in advance and pardon the cross-posting.
NFPA 30 states that IF flammable cabinets are ducted to the ventilation system that the supply be provided at the top and the exhaust be connected to the bottom. Presumably, this creates a downward directed cross
draft that ensures removal of vapors with high vapor density from the bottom of the cabinet.
I have two questions:
1) if there is not a ducted supply does that supply bung stay open or closed?
2) if an existing cabinet is vented with the exhaust from the top should it be changed to vent from the bottom?
Many thanks,
Chris
Christopher E. Kohler, MS, LPG, CCHO
Laboratory Safety Manager, EHS
Laboratory Safety Instructor, ACS
Adjunct Faculty, SPEA
Environmental Health and Safety
1514 E Third Street
Bloomington, IN 47405
(812) 855-5454
cekohler**At_Symbol_Here**iu.edu
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