We offer many different standard mini stem turbines with a stainless steel stem and brass, stainless steel or nylon filament. We have many brushes in various types and filament diameters and lengths. We can also custom design to meet your application needs. This movement causes an area of low pressure at the surface, creating a vacuum that moving in air. Cooler, denser air flows toward the low pressure area at the surface to fill in the space left by the risen, heated air. This creates convection current and thermal energy is transformed into kinetic mechanical energy in the form of moving air or wind.
For more info:http://www.maxwatt.in/products-services/topping-bottoming-turbines/