Profile: Bei jing Sanlicom Technology Co., Ltd. offers ventilation, warming & heating equipments and materials for different kinds of agricultural greenhouses. Our sidewall manual roll-up unit has an internal transfer steel gear. Input and output axis are installed with lubricating bearings & reverse gears. The film length of the manual roll-up unit is 120 meters. Our circulation blower fan is made of light punched aluminum sheets. It is applied to provide ventilation in greenhouse, mining and civil constructions. We also offer cross clips, self drilling screws, fixing clips, draft supporter, drive clamps and steel clips.