1.Few types of profiles,high versatility,low cost.
2.low viewing surface,better visual effect.
3.adjustable& unadjustable hinge work together, stable working condition.
4.Built-in track, underside load bearing, multiple opening forms.
5.multiple sealing strips at frame fan overlap, hidden drainage and lsobaric structure.
6.threshold connections inprove stability and productivity.
7.13mm clearance to ensure no pinch injuries.