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I couldn't find part 3. You basically add the cans to the panel and paint them black. You need an input vent, and an out put vent. http://www.blogger.com/img/blank.gifThere should be a fan that blows the air from your house/greenhouse into the heater, and then venting the hot air into your room. Whatever is near your cans should be able to handle high tempters. This panel can get very hot! The panel should be mounted in a south facing location.
Here are the printable instructions.
instead of building a box, I've seen people just use old windows. We have old windows.
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