Deman supercharger assembly plant is located in Ningbo, Zhejiang, and the main engine is imported from Germany. De Man Compressor (China) Co., Ltd. is a famous professional manufacturer of variable frequency supercharger in China and a national high-tech enterprise. 200 1, imported MOBO original parts and advanced German design system, and the products are equipped with ISO900 1 quality management system. The products are famous for their frequency conversion energy-saving air compressors. In 2006, the first 100% variable frequency supercharger was produced. With the advanced vector control technology of compressor, the only variable frequency screw air compressor in China has been drafted, which is known as the first brand of variable frequency air compressor in China.