(1) Lateral slide: pass, large area of ventilation (2) In-incline: soft ventilation and air change (3) Fit for the gate of the gardens and the doors of verandas of high-grade residential buildings, villas, etc. (4) Different surface dealing and color matching could be adopted both inside and outside of the door frames. (5) Durable, erosion resistant, aging resistant, anti-color fading, and with a life span of over 50 years. (6) Double seal hollow glass, available glass of thickness at: 6, 9, 12, 15, 18, 20, 25mm. (7) Double EPDM tape make use of pressure equilibrium law, day seal (tapeless).