6,Option: tempered/frosted/reflective/low-e/glass with geometric-bar/patterned glass
7,color: white, black walnut, beech, teak, sappily, red walnut, Red Nut-brown
Performance parameters:
1) Sound insulation: RW ≥28dB
2) Wind pressure resistance: third class (GB/T7106)
3) Air permeation resistance: third class (GB/T7108)
4) Water resistance: third class (GB/T7108)
5)U-Value <1.1-2.2