1. Ventilation type: the structural mode of convection between the air outside the shell and the air inside the cabinet equipment cabin of the chassis.

2. Non ventilated: the structure in which the air outside the shell and the air in the cabinet equipment compartment of the chassis do not conduct convection.

3. Heat insulation type: the cabinet shell is a cabinet with multi-layer structure containing low thermal conductivity sandwich materials.

4. Air conditioning type: the structure in which the air outside the cabinet and the air in the cabinet equipment cabin do not conduct convection, and the temperature in the machine is controlled and regulated by air conditioner. Distribution box

5. Heat exchange type: the structure in which the air outside the cabinet and the air inside the equipment compartment of the cabinet are not convective, and the temperature inside the machine is controlled and regulated by heat exchanger.

6. Fan type: the structure of convection between the air outside the cabinet and the air inside the equipment cabin of the cabinet, and the forced convection of the fan is used for heat exchange.

7. Natural ventilation type: convection structure between the air outside the cabinet and the air inside the cabinet equipment cabin, and heat exchange of the equipment inside the cabinet by using natural wind.