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The SpinDuct Professional Air Duct Cleaning System uses RotoFlex-Sweeping^TM Brush Technology.

What is RotoFlex-Sweeping^TM Technology?
The SpinDuct system uses RotoFlex-Sweeping^TM brushes to provide the best maneuverability and cleaning efficiency possible. RotoFlex-Sweeping^TM brushes are designed to automatically adjust to the size of duct being cleaned. The SpinDuct system spins these flexible brushes at a high rpm. Centrifugal force opens the brush diameter to the size of the duct. The SpinDuct includes three sized RotoFlex-Sweeping^TM brushes: Dryer Vent Size (adjusts 3-4in), Standard Duct Size (adjusts 4-18in), and Large Duct Size (adjusts 18-24in). Whether your brush is maneuvering through a round duct or a rectangular duct, you can be sure the RotoFlex-Sweeping^TM brush will adjust to the size you need. Plus, the RotoFlex-Sweeping^TM brushes use soft filament for safe operation in all types of ductwork. In addition, RotoFlex-Sweeping^TM technology also has angled brushes that direct the sweeping action back to the vacuum hose. Combine the flexibility of adjustable brush size and the strategically directed sweeping action of these angled brushes, and you have the best in brushing technology.

Watch the RotoFlex-Sweeping Brush Technology Video: