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Several customers have wanted ovens over a fireplace. Often they don't have the space for a side-by-side fireplace and oven or they have mistaken the wood box under the oven for a fireplace in several of our pictures. I usually discourage them. But then here's an idea - an oven in the smoke chamber. It would be just a matter of supporting one of the 12"x24" firebrick slabs on four corners of firebrick above the throat and damper in the base of an enlarged smoke chamber made with a couple of flue liners. The fireplace smoke and air would vent around the sides and back of the firebrick slab where there should be about twice the cross-sectional area of the throat so the fireplace should draw. I made the 42" fireplace only 30" tall to keep the oven floor down. Even so it is more than four feet above the floor.
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The problem would be to slow down the flow of air through the system which would cool the oven too fast. It should have both an in-throat and chimney top damper and insulation around the smoke chamber/oven. It could be a smoker or slow cooker with temperatures up to about 300 degrees with just a fire in the fireplace. Or you could build a fire in the smoke chamber/oven and get the temperature up but, if you want to keep it up, you would have to close the in-throat damper and maybe adjust down the chimney top damper - which means you couldn't use the fireplace at the same time. It would be anyone's guess how hot the oven would be if you got it started with a fire in the oven and kept and fire going in the fireplace with both dampers open.
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