... panel 2.Produced in strictly system ISO9001: 2000 3.Air and water tight Aluminium window, aluminum window, aluminium ... line design reveals its elegance and nobleness2. Product Features: Air-proof, Water-proof, sound insulation, thermal insulation, Anti-aging, Good- ... ≥ 28dB, Wind pressure resistance: third class (GB/T7106), Air permeation resistance: third class (GB/T7108), Water resistance: third ...