Reinforced Thermal-Insulated Industrial Sectional Overhead Door For Heavy-Duty Factory Entrances Reinforced Thermal-Insulated Industrial Sectional Overhead Door for Heavy-Duty Factory Entrances A Reinforced Thermal-Insulated Industrial Sectional Overhead Door is designed as the main gate for heavy-duty factory entrances. It pairs a strong and reinforced structure with excellent thermal insulation, so the factory stays sealed and energy-efficient even when the entrance sees