Frame-concealedentrancedoorsisdesigned andproducedbyGlazingtec independently, whichconformstotheEur opeanUnionCEstandard.TheproducthasalsobeenapprovedbytheStatePatentOffice (pat entnumber:4787554 ).Thesteel profileofthisdoortypeisimportedfromEurope withstri ctcoldbendingprocess.Thestructureissolidandcorrosion – resistant.Theframe -concealedentrancedoor hasgoodsealingperformance,soundinsulation, dustprevent ionandotherfunctions.Thebottomofthedoorleafissealedbyautomaticbottomsealwhichreducethe theerrorcausedbythegroundintheinstallatio nprocesstotheminimum.Itisthefirstchoiceforhighqualityentancesolution Minimalist design is not only the form of architecture, but also the material and technology .