This is a video, like a big hot box solar collector to do with simple techniques and tools. It took only four hours in this field and make two of these will be returning my energy consumption by 25% My house is only 1,500 sq m people save the planet, if you want help, I want to help. ... I just get dan@modernblacksmith.com Ahold
http://www.youtube.com/watch?v=-u7mstBFbrE&hl=en
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