We are offering air ventilators. runs only on natural wind energy no electricity or generator required noiseless and cost effective exhausts heat, humidity, smoke & dust releases suffocation no maintenance cost no accidental hazards like fire due to short-circuits, electrical shocks low cost of installation assured ventilation for 24 hrs./365 days protects food products and chemicals remove foul smell and maintain hygienic condition 80% depreciation under section 32 of it act.