A picture of the Kaowool insulation on the bench being cut to
Here is the furnace body lined with the Kaowool. I
kept the insulation down from the top about 1" and enlarged the
areas around the drain hole and burner tubes so that the refractory
comes all the way to the metal wall in these areas.
The lid lined and ready to go. That is two 3" PVC
couplings glued end to end. The outside diameter of the couplings is
about 4 inches. I used tape to close up the slight gap between the PVC
form and the hole in the lid (about 1/8" all around).