| 摘要 |
PURPOSE:To attain an improvement of workability, reduction of production cost and prevention of generation of noises by employing a high-speed duct for a main duct so as to make a cross-sectional shape of the main duct small and employing low-speed ducts for branch ducts, which low-speed ducts will not generate noises. CONSTITUTION:A box-shaped distributor body l is provided with a high-speed duct connection port 5 and low-speed duct connection ports 7a, 7b. An inner box 11 is provided within the box-shaped distributor body l in a manner to form gaps 13, 15 between it and an inner wall of the box-shaped distributor body 1. The low-speed duct connection ports are communicated only to an interior of the box-shaped distributor body 1. A part of the inner box 11 is formed by a perforate plate 17 which communicates the gaps 13, 15 to an interior of the inner box 11. |
