Solar air panel

[NM_Shooter]

I've always been intrigued by solar heat.  I found a nice site that has good info.  Dunno if this has been posted here before or not, but thought I would share.  Be sure to read the "rules of thumb" section.

http://www.mobilehomerepair.com/article17solar.htm

[Squirl]

Good build.

Under the rules of thumb. 20% sounds reasonable, this is the same as most passive solar values.  I don't know about the rule of thumb always being at 62 degrees.  I would think it is different for different areas.  It looks like it is a reprint from Rodale from 1981.  I always found Rodale press to be a reliable source of information.