Name??American style vertical sliding window Range??PVC window&door specification??1.Standard American style PVC profile with multi-cavity, good drainage system, effectively insulate heat stream and sound source. Galvanized support steel strengthens its air-pressure resistance. 2.Vertical sliding system uses rolling strip. Window sash can stop at any position. It is a more agreeable window type for reasonable ventilation and light. 3.Dapper profiles for window frame, more weather-proof sealing strips. Perfect air-tightness. 4.Fly screen with aluminium frame fixed outside, but still can be taken away from indoor. 5.Movable sash can be turned down freely for easy cleaning and maintenance.