Structure of the door: The high strength anti- oxidized industry alloy doorframe, (silver oxidizes 10UM), conforms to the 6010-T6 stipulation standard , steel cold-rolling plate applied in rail (static electricity spurts spreads) or the stainless steel. Motion: German SEW motor/special motor for fast roll-up door, Control voltage: 220V/380V Motor power: 0.75-2.2 KW Controlling system: Imported frequency conversion controlling box Curtain fabric: Imported industrial polyester with high density applied, thickness 0.8/1.5 mm. Many colors provided. Wind-resistance rod is convenient for change and reducing maintaining cost.