Jim,The first thing you do is take out the brick because you don't want to hold the heat in the arch. then take apiece of 1/4 inch or so of steel and take the doors off. Cut the steel so that it has notches that way you can use the door hinge pins to hold the steel in place. then find the center and cut a hole for the oil burner. take out the grates and cut a piece of steel to lie in there. After that you get some ceramic blanket rated for 2600 deg and line it by running the blanket one direction then the other direction so there will be no gaps. make sure there is 2 layers on every thing and 3 around the fire box if there is more left lay it in there.To hold the blanket I used 6 5/16 bolts with washers. I used 3 on each side. Leader said I should use ss pins but I used hard bolts and they are holding so far. I am using A beckett afg oil burner with 4.00 gph hollow nozzle with the pump pressure turned up and a 5gph nose cone and she uses 4.98 gph of fuel. You also need a barmetric damper in the stack. Atleast that is how I did mine and it don"t get very warm in the shack!
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Blaisdell's Maple Farm
started on a 2x2 pan in 2000 and now
custom built oil fired 4x12 arch by me
Thor pans Desinged by Thad Blaisdell
4600 taps on a drop flue 8-4 split