Materials Standard
1、Profile:《GB5237-2008》
2、Hardwares：《JG/T 212-2007 》
3、Glass:《JGJ113-2009》
4、System Standard： 《GB8478-2008》

Product Feature：
5、Double hung and Single Hung is available
6、Profile:Main structure thickness 1.4mm
7、Glass:Single and Double glass is available
8、Hardwares:Chinese top brand or Amercian Hunging system hardwares is available
9、Customized profile color is available