In a large ware house or store different items like food products, food grains, chemicals or medicines are stored for long time. It is essential to keep these products free of moisture, dust and heat. Because of such ventilators fresh air is continuously circulated thus keeping the atmosphere cool and dust free. Also they Increase life of roofing sheets, allowing workers a pollution free healthy environment increasing productivity level. Continuous Air Circulation removes humidity emitting out of food grains and chemical drums keeping the environment fresh and dry.