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Most older furnaces and boilers have

Most older furnaces and boilers have naturally drafting chimneys the combustion gases exit the home through the chimney using only their buoyancy combined with the chimney's height naturally drafting chimneys often have problems exhausting the combustion gases because of chimney blockage, wind or pressures inside the home that overcome the buoyancy of the gases. Many handheld augers have cables that are thin enough to pass through common sink traps, though some manufacturers do not recommend.

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