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Low frequency noise component in the air conditioning and engine facility is extremely difficult to deal with as it cannot be absorbed by the existing sound absorbing materials for ventilating ductwork.Moreover, the existing devices for noise control are often bulky, thus it is a need to develop a new type of compact device to control low frequencies with long wavelength.In this article, a compact plate silencer for reflecting low frequency duct noise in a flow-through configuration is under investigation.