This system is used at places where space is a constraint. They can be used at places where the openinig size of the window is big. These will have 3 tracks of sliding interlocked with each other.

These windows are designed in such a way that they are airtight & water tight. Therefore ensuring that no water comes inside when the windows are closed in case water comes inside when the window is open a provision for water drainage is given such that the water is drained out.

These windows are duly reinforced with thick specially designed Steel for greater strength & Safety of the uPVC window.