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

·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;

·Two transmission opening and closing modes:

1.The opening mode of damper plate is controlled by pulley drive motor and counterweight, with simple structure and high space utilization;

2.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.