double hung windows are a common type of indoor door and window products. They have excellent energy-saving and heat-insulating, dust-proof and noise-reducing, and excellent wind pressure resistance. They have beautiful lines and a wide viewing angle. They will not collide with the human body when opened. The frame and sash are wrapped, so there is no risk of the sash falling outwards. They have excellent safety coefficients and many other advantages. They are widely used in high-rise buildings in North America.

Aluminum alloy window is made of aluminum alloy building profiles frame, fan structure window, divided into ordinary aluminum alloy doors and Windows and broken bridge aluminum alloy doors and Windows. Aluminum alloy Windows have beautiful appearance, sealing, high strength, widely used in the field of construction engineering, in home decoration, commonly used aluminum alloy doors and Windows package balcony.