Steel doors and aluminum doors and insulation performance comparison: insulation performance is better than aluminum windows steel windows is good, but better than both the heat transfer coefficient for the whole window just 1.36 times (single window) and 1.44 times (single-frame double glass windows). Steel doors and aluminum doors and lighting performance and sound insulation performance comparison: daylighting performance than aluminum windows steel windows plastic steel doors and windows broken bridge the difference between Dalian, its single-member frame aluminum windows shading large area ratio of about 10%, poor vision and decorative effect steel doors and windows, is not conducive to building lighting energy saving Tianjin lg good good-steel doors and windows, aluminum windows with horizontal cracks sealed plastic windows are basically the same, its acoustic performance is basically the same. Currently steel doors for its outstanding performance and beautiful appearance gradually become the new favorite decoration. However, steel doors and windows in our country after all, belongs to a new building, most people also unfamiliar. So, how to identify the steel doors and cons? First, make it clear that, like other building materials, steel doors and steel doors Dalian Shide have high, medium and low-grade and high-quality and low-quality points, should not be confused. The most important point is that we must check whether the doors and windows manufacturers Construction Committee issued a production license, do not freeloaders, using street workshop production of steel windows, its quality and reputation are not guaranteed. Gorgeous windows, Dalian Shide plastic doors and windows, steel doors and windows provided by Ramada. Search for "Shijiazhuang sun room, bridge aluminum doors and windows, shower room, glass partition" reliable suppliers, network operators choose to have a full alliance Certified: Shijiazhuang Sino-American Door (www.sjzygf.com), trustworthiness and reliability, now "Commercial Union Service" page click on the live chat with us now!