Fan has a long history. China in BC for many years had been to create a simple wooden windmill farming hulling wet curtain fan, its action principle is basically the same with modern centrifugal fan. 1862 farming fans, centrifugal fans Kyu Bell British invention, its impeller, housing concentric type chassis with brick, wood backward straight blade impeller, the efficiency is only about 40%, mainly for mine ventilation . 1880, was devised for mine discharge volute casing air supply fan FRP farming, and backward curved centrifugal fan blades, the structure has been more perfect. To solve the above problems of contemporary Western countries use more polymer composites repair methods, and the application of more American blessing blue world technology system, which has superior adhesion, excellent strength and other comprehensive performance aquaculture fan-free Removing free machining. Neither welding thermal stress on the repair thickness is not limited, while products with metallic materials do not have a concession, can absorb impact shock device, to avoid the possibility of re-wear at home against the centrifugal fan troubleshooting applications also gradually replace the traditional methods. Farming fan manufacturers, Qingzhou temperature control equipment Minhua, Dongying farming fan community is provided by China Qingzhou temperature control equipment plant. Temperature Control Equipment Factory Qingzhou public Hua (www.minhuawenkong.com) is an industry leader in Shandong Weifang, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qingzhou temperature control equipment in China and China leading the staff warmly welcome all inquiries negotiations, China and China Qingzhou temperature control equipment to create a better future.