Slippers of the force state is good

Sliding window: points around, up and down two kinds of push and pull. Sliding windows do not occupy the advantages of indoor space, beautiful appearance, price economy, good sealing. Using high-grade slide, gently push, open flexible. Coupled with large pieces of glass, both to increase the indoor lighting, but also improve the overall shape of the building. Slippers of the force state is good, not easy to damage, but the ventilation area by a certain limit.