Building the Bourry Fire Box for my Long Throat Kiln. This is just the begining and I'm getting a feel for what it is going to take to build my kiln. This is the front of the Bourry Box. The mouse hole is in the middle at the bottom and the secondary air hole is above that. I'm definately going to need some more brick.Front wall measurements are 36 inches wide by 25 inches tall. The interior of the firebox is 27 inches wide and I'm thinking of making it 22.5 inches deep.
Of the many diagrams of this type of firebox, most of them show the firebox door just above the mouse hole. For this kiln I am going to put it on the side of the firebox.
As for the firebox lid I was thinking about just using kiln shelves and kaowool fiber but now I'm thinking about using a cast iron hinged door from an old furnace. I'm not sure how I'll do it yet but I'd like to glue or attach soft insulated firebrick to the underside of the door. I think I'm also going to use 3/4 inch rebar rods instead of the hobs to hold up the wood.
I'm not sure what I'm going to do about the throat arch yet. I suppose the best route to go is use arch brick and then some castable refractory to square it off. But that costs money. Will have to ask some questions but I'm wondering if an arch is a neccesity. Maybey I can just use my standard bricks and build a square opening.
I'll be using Low Duty Hard Fire Brick that measure 9 inches by 4.5 inches by 2.5 inches. These are relatively inexpensive and I can buy them locally at a building supply company. Only problem is they only sell full brick and split brick. I'll pick up about 150 more brick next week so I can finish the fire box.
If all goes well I'll get the rest of my firebrick next week and finish the firebox on the weekend.
