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A conceptual model for window manufacturing which is capable of ventilation, regulating sunlight, and
reducing a traffic and environment noise has been presented in previous studies. This window combines two basic
components: a soundproofing ventilation unit (SVU) and a lighting unit. The former is constructed using a rectangular
cubic with input and output openings at both ends. However, when using the rectangular cubic, the indoor lighting effect
could not be expected to be as great. This paper deals with a parallelepiped shape and those acoustic characteristics based
on the experiments and comparisons with those of rectangular cubic SVU.