Is it just a screen spark arrestor? Ive been seeking unsuccessfully for a cutaway diagram.
The 3003 originally had the patented "Radley/Hunter" stack (left), containing a stationary fan-like structure that caused the smoke gases to whirl around inside the stack. This flung the cinders towards the outer side of a perforated, cylindrical inner part of the stack, where the sparks were disintegrated, extinguished and collected as ash in the lower part of the stack.
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