Why the demand for aluminum doors and windows is much higher than other forms of the doors and windows? So let a Run Co. Zhejiang tell you. Tightness: steel doors and windows because of the frame, fan member is welded to buy security doors, aluminum doors and windows so its airtight screw connections should be slightly better than some of the security doors, but the size of high precision aluminum window profiles, box fan with relatively tight, so the two still at a grade level. Why the demand for aluminum doors and windows is much higher than other forms of the doors and windows? So let a Run Co. tell you. Sound insulation performance: sound insulation performance of the main window insulation effect is accounted for about 80 percent of the window area of ??the glass. Seal gaps with steel doors and aluminum doors levels are basically the same, the sound insulation performance is basically the same. Shanghai Research Institute of Building Science for steel doors and windows and aluminum doors and carried out a series of acoustic performance measurement and comparison of the experiment. Security doors agent _ _ Ganzhou security doors provide a credible INDUSTRIES Run by the Zhejiang Industry and Trade Co., a. Zhejiang A Run Co. (www.zjyrgm.com) strong, credible, Jinhua in Zhejiang security door industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead a Run Industry and Trade into the brilliant and you work for a better future!