In one embodiment, an apparatus includes a frame for mounting in a rack in a position adjacent and external to a network device supported by the rack and a filter module for holding a filter for filtering air entering an air inlet of the network device. The frame comprises an opening for receiving the filter module and positions the filter adjacent to the air inlet of the network device when installed on the rack.

An additional cover provides a cabinet with protection from fluidic ingress. The additional cover includes first and second portions having first and second main sections, respectively, and first and second flanges, respectively, and first and second sidewalls extending between corresponding sidelong edges of at least the first and second main sections. The first and second portions and the first and second sidewalls are arranged to define a flow passage with an inlet at an upper end thereof and an outlet at a lower end thereof. The first and second flanges are provided at the inlet and outlet, respectively, to prevent fluid flow through the flow passage.

An apparatus for obstructing the passage of debris and providing ventilation through a region between a first object and a second object, the apparatus comprising: a body; and a plurality of tines extending from the body, wherein the tines are arranged in use such that when the body is connected to the first object, the tines extend across the region and flex against the second object leaving channels between the tines in the region allowing for ventilation.

A duct opening portion structure includes an air intake duct; a filter that is disposed in an opening portion at an air introduction side of the air intake duct; and a bezel that is disposed in the opening portion at the air introduction side of the air intake duct, the bezel being configured to support the filter. The bezel is attached to a vehicle body-side member, and the bezel includes a rib including a support portion configured to support the filter. The filter is attached to the support portion. The rib is provided with an extension portion having a length that allows the extension portion to be directly or indirectly pressed against a seal member provided at an edge of the opening portion in a state where the bezel is attached to the vehicle body-side member.

In example implementations, a computing system is provided. The computing system includes at least one electronic component, a fan and a filter. The electronic component generates heat that is cooled by an air flow within the computing system that is generated by the fan. The filter is located in a path of the air flow. The filter includes a filter mesh with a strain gauge that is encapsulated and incorporated into the filter mesh to measure an amount that the filter mesh is clogged.

[Object] To propose a projection display device that includes a filter structural body that is excellent in pressure-loss recoverability and can be miniaturized.

[Solution] There is provided a projection display device, including: a filter structural body in which a plurality of filters each including a folding structure in which a concavity-convexity is repeated are stacked. In the filter structural body, respective convex portions of the filters are made to coincide, and between a pitch of any of the filters, one concave portion or a plurality of concave portions of another filter is or are accommodated, and in an inside of the filter having a maximum length in a vertical direction relative to a filter surface, another filter is accommodated.

A gas purification device includes an inflow port provided in an upper part of the gas purification device in a gravitational direction so that gas flows therein, a removing member that removes powder contained in the gas when the gas passes through the removing member, the removing member being disposed at a position such as not to overlap with the inflow port when viewed from above in the gravitational direction, and an outflow port provided in a lower part of the gas purification device in the gravitational direction so that the gas flows out therefrom after passing through the removing member.

A head wearable air purifier is provided. The head wearable air purifier includes a first speaker assembly, a second speaker assembly, a nozzle, and a control circuit. The first and second speaker assemblies are arranged to be worn over the ears of a user. The first speaker assembly includes a filter assembly, a motor-driven impeller for creating an airflow through the filter assembly, and a first speak assembly air outlet downstream from the filter assembly for emitting a filtered airflow from the first speaker assembly. The nozzle can receive the filtered airflow from the first speaker. A nozzle air outlet emits the received filtered airflow towards a mouth and/or a nose of the user. The control circuit can control the motor-driven impeller of the first speaker to have a maximum rotational speed from 9,000 to 18,000 RPM and can implement active noise cancellation for the first speaker assembly.

An air purifier includes a cylindrical filter configured to filter pollutants included in air that enters the air purifier, and a plurality of speakers coupled to a circumference of an outer surface of the cylindrical filter. A communication interface is configured to obtain information from an external device, and a processor is configured to control the plurality of speakers to output an audio signal corresponding to the information.

One aspect of the technology relates to a recirculation filter. The recirculation filter has a first outer layer defining at least a portion of a first flow face of the recirculation filter, where the first flow face is configured to be positioned adjacent to a sensitive component in an electronics enclosure. A second outer layer defines at least a portion of a second flow face of the recirculation filter. A filter material layer is disposed between the first outer layer and the second outer layer. The filter material layer has a central region, wherein a substantial portion of the central region is offset from the first flow face of the recirculation filter. Other aspects are also described.