2010 Volume 34 Issue 3 Pages 249-259
In Japan, the Building Standards Law was revised in 2003 and installation of ventilation systems working for 24 hours was obliged to prevent sick building syndrome. Under such a situation, it is required to develop the ventilation equipment with high sound insulation performance especially for residential buildings in noisy areas. In this study, therefore, a duct-type ventilation system with high sound insulation equipped to glass sliding windows has been developed, in which two types of acoustical filters, resonators with slit-shaped apertures for lower frequencies and series of thin panels for higher frequencies, are combined. The sound insulation performance of the duct-type ventilation system with the designed array of acoustical filters was examined by performing full-scale model experiment using sound intensity measurement technique. As a result, sound insulation performance of the ventilation system was improved in a broad band frequency range.
