| 摘要 |
A method and apparatus for cleaning ducts such as used in HVAC systems includes as part of the apparatus a propeller having pitched, flexible blades for rotatably engaging the interior duct surface for dislodging soot and propelling a cloud of soot along the duct to an evacuation point. The method includes establishing a temporary block in the duct, moving the propeller along the duct for dislodging soot and generation a dust cloud, and evacuating the duct by drawing the soot cloud created by the propeller.
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