PART 3 DiY Wooden Frame. This is a simple alternative to the soda pop can solar furnace. Simply placing a black backer behind glass with a very thin air gap allows for maximum air mixture. In later videos we will testing some 12v blower fans for different CU volume.
Related tags:
![Aspetti della Sardegna N° 5 - Pescatori di corallo /1955 [Istituto LUCE]](http://i4.ytimg.com/vi/ys7Sy_NLILw/0.jpg)