A connection member configured to directly or indirectly connect an air circuit to a patient interface (3000, 3800), the connection member comprising: a tube portion configured to fluidly connect the air circuit to the patient interface; and a vent structure for a respiratory therapy system, the vent structure comprising: a vent housing; and a plurality of partitions inside the vent housing, the plurality of partitions forming therebetween a plurality of vent slots, wherein the vent slots comprise: a vent inlet configured to receive an air flow; and a vent outlet configured to allow the air flow to exit into the surrounding ambient air, wherein the partitions are formed such that each vent slot has a cross-sectional area at a first region of the vent slots that is smaller than a cross-sectional area at a second region of the vent slots, wherein the first region is closer to the vent inlet than the second region; characterized in that each of the partitions comprises a negatively curved portion between the first region and the second region; and each of the partitions comprises a positively curved portion between the first region and the second region. a tube portion configured to fluidly connect the air circuit to the patient interface; and a vent structure for a respiratory therapy system, the vent structure comprising: a vent housing; and a plurality of partitions inside the vent housing, the plurality of partitions forming therebetween a plurality of vent slots, wherein the vent slots comprise: a vent inlet configured to receive an air flow; and a vent outlet configured to allow the air flow to exit into the surrounding ambient air, wherein the partitions are formed such that each vent slot has a cross-sectional area at a first region of the vent slots that is smaller than a cross-sectional area at a second region of the vent slots, wherein the first region is closer to the vent inlet than the second region; characterized in that each of the partitions comprises a negatively curved portion between the first region and the second region; and each of the partitions comprises a positively curved portion between the first region and the second region. a vent housing; and a plurality of partitions inside the vent housing, the plurality of partitions forming therebetween a plurality of vent slots, wherein the vent slots comprise: a vent inlet configured to receive an air flow; and a vent outlet configured to allow the air flow to exit into the surrounding ambient air, a vent inlet configured to receive an air flow; and a vent outlet configured to allow the air flow to exit into the surrounding ambient air, wherein the partitions are formed such that each vent slot has a cross-sectional area at a first region of the vent slots that is smaller than a cross-sectional area at a second region of the vent slots, wherein the first region is closer to the vent inlet than the second region; characterized in that each of the partitions comprises a negatively curved portion between the first region and the second region; and each of the partitions comprises a positively curved portion between the first region and the second region. characterized in that each of the partitions comprises a negatively curved portion between the first region and the second region; and each of the partitions comprises a positively curved portion between the first region and the second region.