Hmmmm. The 2007 (26th Edition) of the ACGIH manual said to "avoid" heat wheels. And the 2010 (27th Edition) included the even stronger prohibition I quoted in a previous post. So if there is some rule promulgated in 2011, I'd love to know about it. I find it hard to talk LEED-besotted architects out of the wheels and would love to have another reference.
Monona
In a message dated 6/21/2011 9:30:23 PM Eastern Daylight Time, baum.janet**At_Symbol_Here**GMAIL.COM writes:
There is a new (January, 2011) restriction against using heat wheels to recover heat from exhaust generated by chemical hoods. I don't have the reference handy but will send it to you tomorrow.
Janet Baum