Solar heater made from aluminum cans

DIY Solar HeaterThis is an interesting way of recycling used aluminum can – create a solar heater with it.

A clever DIYer, Daniel Strohl, painted some aluminum cans black, drilled some holes in the cans, stacked them, and then put them in a box and, voila, air coming out of the box was fifteen degrees warmer than air going into the box. He then pumped the warm air directly into his garage.

Link & Image: Hemmings Auto Blog via Treehugger
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