aluminum alloy window durability,various designs sound and heat insulation ... e glasses.2.double or triple insulating glasses ,the gap for glasses can be various as following:12mm ... ,14mm,19mm,26mm and 30 mm, the glass can be tempered or low-e glasses. ... ,which can create a self-space.Integrates the window frame with the window leaf perfectly,convenient to install.Moth proofing,moisture ...