The Evolution carpet wand from U.S. Products was designed by understanding the theory of air flow. Air flows from a region of high pressure to one of low pressure.
When air flows at higher velocities, especially through with irregular walls, flow is generally disorganized, even chaotic, and tends to form eddies. This is called turbulent flow (See Diagram 1). This is the type of air flow found in most carpet wand designs today.
A relatively large driving pressure is required to sustain turbulent flow. To double the flow rate when you have turbulent flow, you must quadruple the driving pressure.
When flow is low velocity and through narrow tubes, it tends to be more orderly and streamlined and to flow in a straight line.
This type of flow is called laminar flow (See Diagram 2). Unlike turbulent flow, to double the flow rate with laminar flow, one need only double the driving pressure.
The Evolution is the first and the only rotationally molded carpet wand on the market that utilizes the benefits of laminar air flow.
By smoothing the air flow, we have dramatically increased air flow, thus improving water recovery performance.
Through scientific testing against many other traditional wands, we have found that the Evolution left half the residual moisture in the carpet that the best performing wand in the test group removed.
Watch the video for more details on the testing procedure.
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Weighs only 6lb 4oz with the handle.