With an investment of six million us dollar, Zhejiang Three Bamboo Technology Co., Ltd. was established in September 2009 by Hengtai Environmental Development (HK) Co., Ltd. Three Bamboo has Hong Kong's leading mature refrigeration technology and elevator technology which deeply explored into the elevator car air temperature regulation, sterilization, decontamination and its service including research, design, development, manufacturing, installation and maintenance as a whole, providing the best solution to elevator car air.

      Three Bamboo, located in Yuhang Greentown Zhongtai Industrial Park, west of Hangzhou, covers an area of 10,000 square meters, has built more than 13,000 square meters of standard factory buildings, office and laboratory building of 3,000 square meters, equipped with advanced mechanized processing equipment and perfect quality testing equipment, with annual production of 19,000 elevator air conditioners, 5,000 units of the elevator car air purifier, 5,000 units of capacity room ventilation system.