This requirement is in the International Building Code, parts of which California adopted. I would argue back that the fume hood duct is not a ‘product conveyance’ and the vapors will not exceed 20 % of the LEL (you may have to do an experiment to prove this to your local “Authority Having Jurisdiction”
Years ago John Palmer at UCSD spilled a liter of ether in the hood all at once and measured something less that 10% of the LEL – but you may want to talk with him about how he did that…
-Russ
Russell Vernon,
Ph.D.
russell.vernon**At_Symbol_Here**ucr.edu
www.ehs.ucr.edu
(951)
827-5119
From:
DCHAS-L
Discussion List [mailto:DCHAS-L**At_Symbol_Here**list.uvm.edu] On
Behalf Of MICHELLE STEWART
Sent: Friday, March 20,
2009 12:08
PM
To:
DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [DCHAS-L]
Installation of
Fire Sprinkler in Fume hood?
We are being told that
our new
fume hood requires a sprinkler inside the hood in case of a fire. I'm
thinking
this isn't so hot especially when a water reactive chemical is in the
hood! I'm
also thinking this will compromise the structure of the hood. Has anyone
had
this come up or know reasons why this is required and IF its
required?
Michelle Stewart
Coordinator, Science Labs
Respectfully,
Santa Rosa Junior College
Petaluma Campus
680 Sonoma Mountain Parkway
Petaluma, Ca 94954
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