Solar hot air panel made of space-age mud and wattle. Membrane is 4-6 mm utility muslin, cement and acrylic. Frame is hemp, egg carton fiber, cement and acrylic. Stand is for testing purposes only. Retail material cost is equivalent to roofing material (±).

hot air out

ambient air in

Efficiency baffles on the underside and a black color applied to the heat absrbing sun side will be tested and posted for comparison.

To be continued, with larger, faster and less expensive no-mold technique plus short description of the molds that were used to this point.