... blinds 2.No need clean,Sun-shade,Sound insulation,Thermal insulation 3.Good quality & competitive price Product nameHigh ... tightness: 700 PaProduct features1) Air proof,Water proof,Sound insulation,corrosion-resistant2) Environmentally friendly, Energy Efficiency,Thermal insulation3) ... of a double sealing systems. Seals on the sash and the frame are continuous length.&GlazingAll glazing are internal ...