ISD01 industrial sectional doors are designed for industrial buildings, warehouses, production workshops, transport terminals and a variety of industrial premises, where they have to meet stricter requirements if compared with garage sectional doors. Enhanced durability guaranteed by sturdy door construction makes them not only functional but also able to withstand the daily operations in the toughest industrial environments. A perimeter sealing system provides premium thermal efficiency, maintaining the required temperature regime which is an important feature for almost any industrial facility. The door leaf is balanced with a torsion spring mechanism fitted with a QuickFix system which significantly reduces installation time.