Changsha Blower Co., Ltd. former Changsha Blower Works is the drafter of China Standard GB on Roots blower. Since 1958, the company has become a leader in the design and manufacture of positive displacement blowers, vacuum pumps and engineered systems ready to install and run. In china, the company has the large scale of production and the wide sales and after-sales service network all over the country. Thousands of varieties of products exist. The products are widely used in various kinds of industries, such as petroleum, metallurgy, power, mining, building material, chemistry, steel, pneumatic conveying, coal, oxygen making, environment protection and aquaculture, etc.