N2 - Problems associated with designing silencers are presented. Results of direct tests of silencers for cooperation with systems of axial fans, as well as results of numerical tests of a two stage acoustic silencer, are given. The numerical tests enabled determining the distribution of acoustic field inside the silencer and in the surrounding area. In those tests A sound insertion losses for different variants of installation inside the silencer, as well as for two different types of absorbing material used to fill the silencer walls, were determined. Impact of design features of silencers on effectiveness of noise reduction is described. Also, a technical sketch of a universal silencer with significant noise reduction (DipS = 39:1 dB) which can be successfully used in many ventilation systems is presented L1 - http://journals.pan.pl/Content/107279/AoA_122379.pdf L2 - http://journals.pan.pl/Content/107279 PY - 2018 IS - No 2 KW - silencers KW - aerodynamic noise KW - noise reduction KW - ventilation systems KW - numerical tests KW - acoustic field KW - sound absorbing cassettes KW - dispersing component A1 - PierchaƂa, Marek PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 43 DA - 2018.06.15 T1 - Testing the Acoustic Silencers UR - http://journals.pan.pl/dlibra/publication/edition/107279 T2 - Archives of Acoustics