Textile vent assembly

A CPAP system for providing gas at positive pressure for respiratory therapy to a patient, the CPAP system comprising:

• an RPT device configured to supply a flow of gas at a therapeutic pressure:
• a patient interface forming a plenum chamber pressurizable to the therapeutic pressure, the patient interface including a seal-forming structure constructed and arranged to form a seal with a region of a patient's face surrounding an entrance to a patient's airways;
• an air delivery conduit configured to pass the flow of gas at the therapeutic pressure from the RPT device to the patient interface;
• and
• a vent assembly configured to provide a vent flow of gas to discharge gas exhaled by the patient from a pressurized volume to ambient, the vent assembly comprising:
• a vent member comprises a textile material, the vent member including a plurality of vent holes to allow gas to be discharged from the pressurized volume to ambient;
• a diffusing member comprising a textile material, the diffusing member configured and arranged such that the plurality of vent holes are covered by the diffusing member;
• and
• a support structure to support the diffusing member in spaced relation from the vent member,
• wherein the support structure includes an opening to allow gas to be discharged along a primary vent flow path and lateral openings to allow gas to be discharged along a secondary vent flow path, and the diffusing member is supported by the support structure such that the opening is covered by the diffusing member so that vent flow passes through the diffusing member along the primary vent flow path and the lateral openings are not covered by the diffusing member so that vent flow bypasses the diffusing member along the secondary vent flow path.

A vent assembly configured to provide a vent flow of gas to discharge gas from a pressurized volume to ambient, the vent assembly comprising:

• at least one first orifice to allow gas to be discharged from the pressurized volume to ambient along a primary vent flow path;
• at least one second orifice to allow gas to be discharged from the pressurized volume to ambient along a secondary vent flow path;
• a diffusing member configured and arranged such that the at least one first orifice is covered by the diffusing member so that vent flow passes through the diffusing member along the primary vent flow path and the at least one second orifice is not covered by the diffusing member so that vent flow bypasses the diffusing member along the secondary vent flow path;
• and
• a membrane structured and arranged to apportion the vent flow of gas along the primary vent flow path and the secondary vent flow path.