Reference
Solar air heater
Hot air outlet port, 84mm of diameter
Mounting six wooden pieces on the back plate
Drilled 2mm holes where two screws go in
This was how I secured each wooden piece on the back plate: a square wooden piece, two C-clamps.
Back side
Front side
Four cold air intake ports
The size of port is 565.20 square mm. It’s made out of five circles whose diameter is 12mm, the biggest drill bit I have.
I spent 20,000 KRW for two glass plates, 510mm x 400mm, thickness 5 mm.
Freedom, World peace in unity! 