Create Solar Heat for Metal Buildings Using TAP

The low-cost way to add solar heat to metal buildings, including how to build using the TAP system, cost of materials, and diagrams for ducts, dampers and framing.

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The integrated thermosiphoning air panel (TAP) is the perfect solar collector for metal buildings because the side of the structure can act as the unit's absorber plate.
ILLUSTRATION: MOTHER EARTH NEWS STAFF