| 摘要 |
PURPOSE: A built-up ventilation type soundproof device for a window is provided to reduce noise transmitted into a room when opening a window to ventilate and to reduce indoor noise simultaneously with ventilation. CONSTITUTION: The built-up ventilation type soundproof device(1) for a window comprises a rectangular soundproofed window(2) provided with many ventilating holes(3); and a curved variable duct(4) whose one end is provided with an air hole(5) corresponding to the ventilating hole(3) of the soundproofed window(2) and the other end is projected outward from the soundproofed window(2).
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