The market of aluminium alloy door window is bigger and bigger now, aluminium kitchen door designs is used on a lot of buildings, say to should learn how to judge material of aluminium alloy door window as a shrewd consumer so stand or fall, how to judge the stand or fall of aluminium alloy door window shrewdly.  

Profile thickness: aluminum alloy sliding door has 70 series, 90 series commonly two kinds, the aluminum alloy sliding door of residential interior uses 70 series to be ok.  

The series number of doors and windows indicates the number of millimeters in the thickness of the door frame.  

Aluminum alloy sliding Windows used as closed balconies should not be less than 70 series.