I found this:
near as I can tell its from 2008?
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Kennedy, Sheila
Sent: Friday, August 22, 2014 6:59 PM
Subject: [DCHAS-L] 1 hood = 3 American houses
I saw it again today: "Ventilation is the largest user of energy in labs: One fume hood is the equivalent of 3 households"
I have never questioned this. In fact, I teach it & it makes people sit up & pay attention (when we look around at 6 hoods in one lab, then think about how many labs we have on campus!)
Now I need to ask - does anyone have a source for this item? How old is it? Is it still true? Is there a new number/estimate to account for VAV hoods?
Sheila M. Kennedy, C.H.O.
Safety Coordinator | Teaching Laboratories
Chemistry & Biochemistry |University of California, San Diego
9500 Gilman Dr. | La Jolla, CA 92093-0303
( (858) 534 - 0221 | 2 (858) 534 - 7687
s1kennedy**At_Symbol_Here**ucsd.edu | http://www-chem.ucsd.edu
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