Firstly, the wind pressure resistance, air tightness and stability of doors and windows should be considered; when there are requirements for wind pressure, the number and layout of locks should be determined according to the local wind pressure standard value and floor height, so as to ensure the required wind pressure resistance, air tightness and stability requirements of doors and windows.

Guarantee safety: Considering the factors determined by the width and weight of doors and windows, the load-bearing grade, specifications and sizes of window hinge, sliding brace, pulley and other load-bearing components are selected.