-Produced by wooden, American style, with firm connection and tidy assembly; -Double-sealed insulating glass; -Sealed drain system with excellent airproof and waterproof ability; -Varieties of opening ways and optional aeration effect; -Carrying the í¦equal size roomí¦ theory has excellent heat-preservation, sound insulation and less-transfiguration ability; -Can be connected with all kinds of American wooden doors and make the series more prefect; -The slim frame let the window obtain the large lighting area and bright effect; as well as need less profile and be economy at factually.
