A vent for a component of a respiratory therapy system

A vent for venting exhaust gases from a component of a respiratory therapy system, the vent comprising:

• a substrate having an inner surface and an outer surface,
• at least one vent hole extending through the substrate, the vent hole comprising an exhaust gas inlet at the inner surface of the substrate and an exhaust gas outlet at an outer surface of the substrate, the exhaust gas inlet and the exhaust gas outlet each having a respective centre,
• the exhaust gas inlet and the exhaust gas outlet defining a draft direction being the direction that exhausted air flows out of the vent hole and which is defined by an axis that extends through the centre of the inlet and the centre of the outlet of the vent hole, wherein
• the draft direction of the vent hole is not aligned with a draw direction, the draw direction being the direction at which a mould tool is opened or removed relative to the vent during manufacture.

A vent for venting exhaust gases from a component of a respiratory therapy system, the vent comprising:

• a substrate having an inner surface and an outer surface,
• at least two vent holes extending through the substrate and each having a circumference, an exhaust gas inlet at the inner surface of the substrate and an exhaust gas outlet at an outer surface of the substrate, a sidewall being defined between the exhaust gas inlet and the exhaust gas outlet of each vent hole,
• the exhaust gas inlet of each vent hole having a different diameter to the diameter of the exhaust gas outlet of that vent hole such that the sidewall of each vent hole is inclined at an angle of inclination between the exhaust gas inlet and the exhaust gas outlet;
• wherein
• the angle of inclination of the inclined side wall of one vent hole is different from the angle of inclination of the side wall of another vent hole.

A vent for venting exhaust gases from a component of a respiratory therapy system, the vent comprising:

• a substrate having an inner surface and an outer surface,
• at least two vent holes extending through the substrate, each vent hole comprising a bore extending through the substrate, the bore comprising an exhaust gas inlet at the inner surface of the substrate and an exhaust gas outlet at an outer surface of the substrate, the exhaust gas inlet and the exhaust gas outlet each defining a respective centre,
• the exhaust gas inlet and the exhaust gas outlet of each vent hole defining a draft direction being the direction that exhausted air flows out of that vent hole and defined by an axis that extends through the centre of the inlet and through the centre of the outlet of that vent hole, wherein
• the draft direction of one vent hole is different to the draft direction of the other vent hole.

A vent for venting exhaust gases from a component of a respiratory therapy system, the vent comprising:

• a substrate having an inner surface and an outer surface,
• at least one vent hole extending through the substrate and having a circumference, the vent hole comprising an exhaust gas inlet at the inner surface of the substrate and an exhaust gas outlet at an outer surface of the substrate, a sidewall being defined between the exhaust gas inlet and the exhaust gas outlet,
• the exhaust gas inlet having a different diameter to the diameter of the exhaust gas outlet such that the sidewall of the vent hole is inclined at an angle of inclination between the exhaust gas inlet and the exhaust gas outlet;
• wherein
• the angle of inclination of the inclined side wall of the vent is non-constant with respect to a draw direction, the draw direction being the direction in which a mould tool is opened or removed during manufacture of the vent.