I've also attempted to catagorize passive air-heating solar panels by
configuration atwww.iedu.com/DeSoto/SC_Types.html- which might be a
good starting point for anyone interested in designing their own
panels.

Thanks very much for sharing your experiences and info! I think it's
a fantastic idea, and it's only a matter of time before non-petroleum
based energy becomes a necessity. One question - if a potential
customer doesn't happen to be located near Wisconsin, do you ship the
panels, or sell detailed instructions, or have some other method of
distributing your product more widely?
I was also wondering... if you turn one of those panels upside down in
the summer, will it blow cool air? g
Thanks again,
Andy