... blade Angle, achieve natural lighting, complete functions such as shading. 3, environmental protection: this product has the dust, prevent lampblack, ... .9 the following, and ordinary insulating glass K value is 3.0; Low-e hollow glass K value is 2.4, single ... energy consumption greatly reduced. 5, safety: because the double-layer tempered glass structure, and the strike force was higher, top or coastal ...