Industrial Aluminum Sectional Garage Door 1. Excellent wind resistance: Steel sandwich door panel with good strength. 2. Excellent thermal insulation: Total thickness of door panel reaches 40mm 3. High-frequency operation: Torsion spring balance system counteracts most drag force during opening. 4. Auto-Manual dual operation modes: When there is power failure or breakdown, the door can be opened or closed by manual operation chain. Balance torsion spring system counteracts most of drag- force of opening. It can be opened by hand with a little force. 5. Various climbing modes: Climbing modes can be selected according to conditions of wall hole and available space1.Standard climbing mode 2. High climbing mode 3. Vertical climbing mode Garage Door Specification: …
