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Daniel -- 1. In order to scour the carbon from the flues a strong draft is required. That's why the engine is worked hard when sanding flues. The sharp exhaust, which is directed to the stack through the smoke box, increases the draft. Most of the sand and carbon will be ejected through the stack, although some will accumulate at the bottom of the smoke box. 2. Every tour of duty, or more frequently, as conditions require. --John
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