I built a much larger version of one of these before with an additional baffle inside to get it even hotter, and installed it at a house. I used aluminum sheets from the newspaper local to me, their offset printing stuff, for the backing, and black stove paint. Worked great, it pumped well over 100 degree heat directly into the room when it was in the teens outside.
I helped work on a huge version of this, but it was active, it used fans. It covered the whole south facing wall of a food co-op I was a member of and really cut their heating bills down. They used scrap (forget what size now, more than a gallon I think) gallon tins that bulk cooking oil came in, painted flat black, against the wall outside (not empty though, seems to me if am remembering correctly they filled them with normal water/antifreeze mix to work as thermal storage), then a frame work with a lot of glass covering that, then a fan to pump the air once it got to a certain temp. I just looked to see if that co-op still exists and maybe some pics, but no dice. As far as I remember, all of it but the nails and screws and so on, and the paint, was salvage material, ie, "free".
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