Thermal Insulation Performance Aluminum Spiral High Speed Door Our Thermal Insulation Performance Spiral High Speed Door is designed for temperature-sensitive facilities that need to control heat exchange at every opening. The 40mm or 43mm insulated door panels, filled with high-density polyurethane foam up to 50 kg/m3, deliver excellent thermal insulation to stabilize indoor temperatures and reduce energy costs. Combined with multi-point sealing and rapid opening cycles,