The first generation: the traditional compact spinning negative pressure fan has been basically eliminated because of its inherent deficiency in performance, and can only be seen in the old factory without compact spinning transformation. At present, the main manufacturer is Hasega.
The second generation: JMF-I compact spinning fan, which is the replacement product of the first generation, and its performance is obviously improved compared with the first generation. At present, the main manufacturer is Hongda.
The third generation: JMF-II energy-saving explosion-proof compact spinning fan is the latest patented product, and its performance has been greatly improved compared with the second generation. Mainly produces aluminum alloy impeller, pneumatic structure and explosion-proof technology with unique patent, which makes the fan significantly improve in energy saving and explosion-proof. Compared with the second-generation fan, the average energy saving is 10-20%, which conforms to the national concept of energy saving and consumption reduction, and also reduces the energy cost for users. At present, the main manufacturer is Xing Chi.