公开(公告)号：EP1319109A1

公开(公告)日：2003-06-18

申请号：EP01967895.2

申请日：2001-09-17

申请人： ABB Fläkt AB

发明人： NYGREN, Tomas ,  JOHANSSON, Claes-Göran ,  LARSSON, Mats ,  ABOM, Mats

IPC分类号： E04F17/00 ,  F24F13/24 ,  G10K11/178

CPC分类号： F24F13/24 ,  F24F2013/242 ,  F24F2013/247 ,  G10K11/178 ,  G10K2210/104 ,  G10K2210/112 ,  G10K2210/3224 ,  G10K2210/509

摘要： A ventilating system for transport of air in environments with requirements concerning sound comprising a plurality of channel sections and a sound-attenuating device comprising both active and passive sound attenuation. The passive sound attenuation comprises a reactive part and a resistive part, and the active, the reactive and the resistive attenuation are adapted to attend to attenuation within separate frequency ranges.