AIR VENTILATOR MANUFACTURER & EXPORTER IN AHMEDABAD GUJARAT INDIA.  New technology – Ventilator runs without Electric Power.  No Electricity - No Operating cost.  Runs on natural wind power, weather, and storm proof.  Specially designed vanes to deflect rainwater.  Rotates on Stainless Steel balls, so maintenance free. http://www.cooltechsystems.in/ Contact:-+91-9724897843