sliding window vertical sliding

Features:
1) The design is reasonable and novel, makes the aluminium window and plastic window together
2) With complementary advantages
3) The track, wheel, handrail, locking point can use the fittings of plastic steel window
4) Flexibly open, no noise, beautifully assembled
5) The internal and external frame each uses one type of profile association
6) The assemble of frame and fans joint by corner group, easily processed and with high efficiency
7) Can choose single glass or hollow type
8) Can use three-track frame, and both inside and outside screen can be chosen
9) Vertical sliding window with the vertical sliding fittings