There are many models of aluminum alloy door and window materials, and the specifications are mainly 35 series, 38 series, 40 series, 60 series, 70 series and 90 series. Where 35 and 38 refer to the widths of the main frame of aluminum alloy profiles of 35 mm and 38 mm respectively. Balcony sealing usually adopts 70 series and 90 series.