01The parts a flue brush never touches
A standard sweep is built around one job: running a brush the length of the flue liner.
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That is the right tool for the flue, and the wrong tool for everything below it. The smoke chamber — the widening, angled cavity directly above the firebox where smoke slows down before it draws up the flue — has sloped walls a straight brush cannot follow, and creosote collects there in shapes a flue brush was never designed to clear. Below the firebox, an older masonry fireplace often has an ash pit: a storage cavity with its own small cleanout door, sometimes not opened in years. Chimney cleaning is the service built for both of those spaces, done by hand rather than by brush alone.

