Columbia Missouri USA Client,Oak Wood with Exterior Aluminum Cladding,Super Wide Heavy Duty Lift Sliding glass Door on China WDMAWhen we look at the whole door, around 85% area is Glass. That means the performance of door almost depends on the glass units. For all our windows and doors exported to North America, Dual Panes must be Tempered Glass for better protection of peoples safety. The SGCC and IGCC certified glass units is the basic configuration, For many U. S. climates, we recommend that Low e Insulating Glass filled with Argon, since the unique Low E technology delivers