the patent product with national utility model, 5 sealing with excellent air tightness, the product can resist severe dust storm and haze in north china;
heavy sash material, equipped with 6mm 12a 6mm hollow glass;
unique shape and multiple sealing, the sound insulation, heat preservation and water tightness of the product are improved to a new height;
the appearance of design is introverted and smooth.
|隔声性||2级 25≤rw ctr<30|