Waterproof: aluminum alloy doors and windows material with special formula, bibulous rate is less than 0.1%, the material itself are forms of double-layer sealing between sash, gaps are equipped with excellent sealing strip, and to open a drain box material position.
Angle is through mechanical welding forming, so the broken bridge aluminum alloy double hung window sealed performance is good, don't ooze water and moisture, noise insulation.
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