| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ventilation system which can exhibit high sound deadening effect by arranging a pipe unit provided with a fractionating plate in a ventilation duct, is small in air-flow resistance, does not have to be controlled electronically and is easy to attach. <P>SOLUTION: In a ventilation system provided with an air-passing duct arranged through a wall of a building, pipe units 5 comprising short cylinders are continuously arranged to constitute an air-passing duct; a plurality of fractionating plates 7 which forms air flow passages are arranged in those pipe units 5, respectively; the pipe units 5 which are different in arrangement forms of the fractioning plates 7 are continuously arranged backward and forward; and noises propagating in the duct together with air are attenuated by the fractioning plates 7, thereby obtaining sound shielding effect. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
