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EDU75HI system window inside is an innovative system window. The imported high-strength hardware and integrated sealant strips and other high-quality materials meet international standards, with many advantages such as rainproof, anti-theft, structural stability, etc. It has great performance because of the multiple features, such as good sealing, heat insulation, sound insulation, water tightness, air tightness, wind pressure resistance and so on. The inward opening structures bring users a new experience and consider the safety of users' lives and property.