The casement window is superior to the sliding window in performance, but the sliding window is superior to the casement window in processing and operation. Because of this reason, casement Windows are widely used in urban commercial and residential buildings, office buildings, high-end residences, villas and other high-end buildings; The sliding window is widely used in industrial plants, rural houses and other middle and low grade buildings. Aluminum alloy doors and Windows are classified in terms of their opening methods, and the more popular and practical window types on the market are push-pull Windows and casement Windows. Casement window refers to the door and window whose hinge (hinge) is installed on the side of the door and window to open inward or outward; Sliding doors and Windows mainly refer to Windows and doors whose sashes are pushed and pulled vertically in the horizontal direction. Push-pull and flat opening are compared in the case of using the same glass and accessories.