Aluminum alloy wa white aluminum & windows should pay attention to the elevation of the indoor ground when the door frame is installed, if carpet is spread inside, the corresponding gap should be reserved when the board waits.  The surface of the ground spring should be common to the indoor ground elevation.  

The wind resistance of doors and windows sometimes depends on the stability of the building, after all, it is impossible to have broken walls.  doors and windows without a grip will certainly be broken.