
The industry is concentration; the key players include Mann+Hummel, Absolent, Showa Denki, Franke Filter, Keller Lufttechnik, 3nine, Esta, Aeroex , Yhb, Losma, Shangyu Jinke, Wuxi Bodhi, Contec, Kaeser. Among them, Mann+Hummel and Absolent are the leaders.