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 5,6
[5] Bob tacks more of the galvanized veneer to the upper half of the exterior form. [6] The completed casting frame prior to spooning in the Kast-Set. All the metal surfaces have been coated with oil or grease before the "mud" is laid in.