The multi-layer valgus large plate design has good diversion effect;

During operation, it does not occupy the space in the house, and the sealing and thermal insulation can be excellent;

The insulation board adopts XPS extruded sandwich board, and the two sides are made of FRP. The overall thickness of the board is 40mm, with excellent high-strength compression resistance;

The opening mechanism of the damper plate is rack opening and closing, with high synchronization and consistent opening and closing angle to ensure more uniform ventilation in the house;

The door panel size can be customized according to the opening size.