Presented here is a concept for manufacturing windows which are capable of ventilating, regulating sunlight and reducing traffic noise inside the homes of the developing countries in tropical climate zones. A previous study discussed a rectangular soundproofing ventilation unit having an inlet and an outlet located on the opposite face, which results in a reduced outlet area. As a result, the ventilation function is reduced. To improve this problem, a rectangular soundproofing ventilation unit

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... eaturing an inlet and an outlet which is located on the crossed right angle face is proposed in this work. First, the outlet sound pressure is calculated based on the wave equation. Next, to maximize the sound proofing ability, the shape and location of the inlet and the outlet are determined by an investigation of the distribution of higher order mode waves formed inside the soundproofing ventilation unit. Finally, experimental results based on the reverberation chamber method are shown to be in reasonable agreement with our theoretical predictions. Higher order mode, Wave equation, attenuation level, velocity potential, insertion loss 1. Fig.1 Soundproofing ventilation windows Doctoral Course,