Ventilation systems noise reduction issue

There been obtained the results of the ventilation system research in this paper. Acoustic characteristics of the noise within the ventilation system were investigated. Noise reduction is the main goal of carried out research. Calculation of that process was performed by using ANSYS-Fluent. The reduction of the noise level for 15 dB was received. It was achieved due to using a Venturi tube and a lemniscate diffuser in the ventilation system. Geometric parameters of those devices have been optimized.