This utility model pertains to
noise reduction structures, specifically a
noise reduction duct structure, comprising a duct body fixed to the air outlet of a device to be
noise-reduced, with an exhaust port at one end of the duct body; the duct body includes two side plates fixed to the air outlet of the device to be noise-reduced and a back plate connecting the two side plates, the two side plates and the back plate forming a
noise reduction duct, the back plate and the air outlet of the device to be noise-reduced being opposite each other, and the exhaust port being formed by the ends of the two side plates and the back plate; the back plate and the plane of the air outlet of the device to be noise-reduced forming a certain angle, and a clamping plate located inside the
noise reduction duct is fixed on the back plate, the clamping plate being parallel to the side plates; a cavity is provided inside the clamping plate, the cavity being filled with sound-absorbing material; through holes are provided on both sides of the clamping plate; this utility model improves the
noise reduction effect.