Build a High Efficiency Fireplace (90% Efficient!)

It's possible to build a high efficiency fireplace using cast clay for the firebox and sheet metal for the stovepipe.

066 efficient fireplace 3,4
[3] The inner and outer braced plywood forms ready for covering. [4] Alex finishes fastening a sheet-metal "skin" to the inner section of the mold.
BOB CHRISTENSEN