tor consist of two brick layers with an air space between them. The inner layer is made of 4.5 in of firebrick and the 9-in outer layer is made of regular brick.
Flue-fed apartment incinerators have a draft-control damper in the stack, right above the furnace. This damper is pivoted and counterweighted to close when a chute door opens to charge refuse into the furnace. As a result, draft at the furnace remains relatively constant. To withstand flame impingement, the draft-control damper should be made of 20-gauge 302 stainless steel.
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