Vertical PVC Side Rolling Door Madoors System Production Our vertical type side roller PVC tarpaulin fast door systems are 100% domestically manufactured and guaranteed for 2 years. There is no shortage of spare parts. There is little to no risk of failure. PVC Vertical Side Rolling Fast Door System Features Frequent opening and closing is convenient. Frequency converter control unit that provides deceleration in starting and stopping Roll or folding type - German origin 380 V AC / 50 Hz. shaft driven motor Manual opening in case of power failure High quality PVC tarpaulin Weldless, one piece, steel side rails PVC bonding with high frequency welding Transparent observation window Radar, metal mass detector, remote control, ip switch, card or password access systems Automatic closing Safety photocell Roller pvc doors It works by collecting helically.