Abstract: A device configured to generate an air flow, the device including: a compressor; an air flow duct arranged to convey a flow of air generated by the compressor; a gas-filled cavity disposed beside the air flow duct; a wall separating the air flow duct and the cavity, the wall including at least one aperture; and an acoustic resistive screen covering and held in tension over the aperture of the wall. The screen is in fluid contact with air in the air flow duct and gas in the cavity and is configured to resist air flow between the duct and the cavity. The resistive screen and the cavity together define a noise-damping resonator.

Abstract: A protection circuit for an electric appliance that is configured to control power supply to an associated electrical component of the appliance such as a heating device, lamp or motor in the event that unsafe conditions are detected. The protection circuit includes a first comparator module configured to compare an operating parameter input signal to a threshold value and to output a first control signal to a first switching circuit configured to control power flow to the associated electrical component. The first comparator module is configured to receive an enable/disable signal from a first state-change latching device, which is responsive to a state change of the first control signal from the first comparator module, in response to which the state-change latching device changes the enable/disable signal from an enable state to a disable state thereby to set the first control signal into an off state.

Abstract: An air amplifier for directing airflow from a fan assembly, and a fan assembly including an air amplifier. The air amplifier includes an inlet for receiving airflow from a fan assembly, and an airflow cavity. The airflow cavity includes a first wall and a second wall that define an airflow passageway extending towards an exhaust outlet for emitting air. A divider body is provided within the passageway. The divider body divides the airflow passageway into a first exhaust passageway and a second exhaust passageway. The divider body tapers towards the exhaust outlet.

Abstract: A vehicle is disclosed. The vehicle includes a passenger cabin; a steering wheel having a hub and a rim; and a ventilation system having a first air outlet for discharging a first jet of air, and a second air outlet for discharging a second jet of air. The first jet of air projects through a gap between the hub and the rim, and the second jet of air intersects and deflects the first jet of air.

Abstract: A head wearable air purifier is provided. The head wearable air purifier includes a first speaker assembly and a second speaker assembly. The first speaker assembly includes a filter assembly, a motor-driven impeller for creating an airflow through the filter assembly, and an air outlet downstream from the filter assembly for emitting a filtered airflow from the speaker assembly. The head wearable air purifier further includes a nozzle and a control circuit. The nozzle is arranged to receive the filtered airflow from the first speaker assembly. Further, the nozzle includes an air outlet arranged to emit the received filtered airflow from the head wearable air purifier. The control circuit is arranged to control a rotational speed of the motor-driven impeller of the first speaker assembly such that the maximum rotational speed of the motor-driven impeller is from 9,000 to 18,000 RPM.

Abstract: A vehicle cabin filter assembly comprising a filter module and a further filter module positioned downstream of the filter module. Each filter module comprises one or more filter elements. The filter elements of the filter module are pleated at a first pleat pitch and comprise a gas filter element. The filter elements of the further filter module are pleated at a second pleat pitch and comprise a particulate filter element. And the second pleat pitch is smaller than the first pleat pitch.