Diffuser arrangements for a vent of a respiratory interface

1. A diffuser arrangement for diffusing gases exhausted from a vent of a respiratory interface assembly, comprising:

a support structure comprising a first wall portion and a second wall portion defining a chamber therebetween, wherein each of the first wall portion and the second wall portion comprise perforations through which the exhaust gases can flow;

a diffuser element positioned within the chamber between the first wall portion and the second wall portion; and

a hinge that permits the first wall portion and the second wall portion to be separated to provide access to the chamber;

wherein the support structure and the diffuser element are removable from a structure that defines or carries the vent,

wherein the diffuser element has at least a portion formed from a knit or woven material,

wherein the diffuser element comprises a first surface and a second surface, at least the first surface being treated with a surface texture, and

wherein the first surface defines an inlet surface and the surface texture comprises a roughened surface texture.

2. The diffuser arrangement of claim 1 , wherein the diffuser element is arranged and configured to transmit a flow of between 16-22 L/min at 4 cm H2O, a flow of between 32-42 L/min at 13 cm H2O and a flow of between 43-59 L/min at 25 cm H2O.

3. The diffuser arrangement of claim 1 , wherein the diffuser element is arranged and configured to transmit a flow of between 17-18 L/min at 4 cm H2O, a flow of between 33-35 L/min at 13 cm H2O and a flow of between 44-53 L/min at 25 cm H2O.

4. The diffuser arrangement of claim 1 , wherein the support structure comprises a snap fit component configured to couple the support structure to the structure that defines or carries the vent.

5. A diffuser arrangement for diffusing gases exhausted from a vent of a respiratory interface assembly, comprising:

a support structure comprising a first wall portion and a second wall portion defining a chamber therebetween, wherein each of the first wall portion and the second wall portion comprise perforations through which the exhaust gases can flow; and

a diffuser element positioned within the chamber between the first wall portion and the second wall portion, wherein the diffuser element comprises a first surface and a second surface, wherein the first surface defines an inlet surface such that a flow of gas through the vent passes through the first surface before passing through the second surface, wherein the first surface comprises a roughened surface texture relative to the second surface;

wherein the diffuser element is removable from the chamber or the support structure and diffuser element are removable from a structure that defines or carries the vent.

6. The diffuser arrangement of claim 5 , wherein the diffuser element is a relatively rigid disk.

7. The diffuser arrangement of claim 6 , wherein the disk is circular in shape.

8. The diffuser arrangement of claim 6 , further comprising an opening to the chamber configured to allow the disk to be inserted into the chamber through the opening.

9. The diffuser arrangement of claim 5 , wherein the diffuser element has at least a portion formed from a knit or woven material.

10. The diffuser arrangement of claim 9 , wherein the diffuser element is arranged and configured to transmit a flow of between 16-22 L/min at 4 cm H2O, a flow of between 32-42 L/min at 13 cm H2O and a flow of between 43-59 L/min at 25 cm H2O.

11. The diffuser arrangement of claim 9 , wherein the diffuser element is arranged and configured to transmit a flow of between 17-18 L/min at 4 cm H2O, a flow of between 33-35 L/min at 13 cm H2O and a flow of between 44-53 L/min at 25 cm H2O.

12. The diffuser arrangement of claim 5 , further comprising a hinge that permits the first wall portion and the second wall portion to be separated to provide access to the chamber.

13. The diffuser arrangement of claim 5 , wherein the second surface of the diffuser element comprises a sheer surface.