"Aerovironment is designing these wind microturbines specifically for the urban environment: No need for a tower, the blades rotate more slowly and silently, and they are set at an angle that allows them to benefit from the wind that is bouncing up the walls and escalating them vertically."http://www.treehugger.com/files/2008/06/wind-power-urban-architectural-microturbines.php
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