A filtration system includes an air cleaner housing and a filter element. The air cleaner housing includes a base and a removable cover. At least one of the base or the cover defines a cavity and a protrusion extending into the cavity. The filter element is disposed within the cavity. The filter element includes a plurality of media blocks each including a pleated filter media. The plurality of media blocks are arranged in arch shapes of approximately equal inner radii. The plurality of media blocks are coupled to each other along opposing edges that extend along a pleat direction of the pleated filter media. The media blocks together define at least one void that extends along the protrusion. The protrusion occupies a portion of the void.

An air purifier includes an interior volume divided into upper and lower chambers, with a motorized fan assembly being positioned within the upper chamber. An ultraviolet (UV) light source is positioned within the lower chamber. A lower fan shroud includes concentric annular ribs that extend axially into the lower chamber and terminate in respective flared distal ends. The flared distal ends deflect light from the UV light source to reduce leakage of the light into the upper chamber. A diffuser can surrounds the UV light source, is affixed to the fan shroud, and has angled louvers deflecting the light to further reduce leakage thereof. Embodiments include a cylindrical media basket surrounding the diffuser can and having a media material disposed therein or thereon. The louvers are oriented to direct the light from the UV light source toward the media material.

A battery pack according to an embodiment of the present disclosure can include at least one battery module with a plurality of battery cell stacks. The battery pack can include a pack frame that houses the battery module and a vent flow path through which gas containing dust generated from the battery module moves. A final filter of the battery pack can filter the dust before the gas containing the dust is discharged to the outside of the battery pack. The battery pack can include a primary filter that is provided at a point where the direction of the vent flow path changes, and primarily filters the dust before the final filter.

A dock for a vacuum cleaner comprising a cleaner head. The cleaner head includes a main housing and a neck portion that extends from the main housing. The dock includes a first abutment portion that abuts the main housing of the cleaner head when the cleaner head is located in the dock. The dock also includes a second abutment portion that abuts the neck portion of the cleaner head when the cleaner head is located in the dock.

Provided is a filtration device that can increase a filtration treatment amount by suppressing clogging of a filtration filter. A filtration device according to the present invention includes: a filtration filter that includes a filter that filters a filtration target contained in a fluid, and a frame that holds the filter; a support structure that holds the frame such that the filter is bent; and a fluid supplying unit that supplies the fluid with the filter being in a bent state.

Screen systems and methods are provided which remove particulates from a process gas stream. According to the systems and methods, a screen element is provided which is adapted to allow a process gas stream to pass therethrough and thereby remove particulates entrained in the process gas stream. An arcuately (e.g., spirally) shaped particulate trap is positioned along a bottom region of the screen element for receiving and collecting the particulates removed from the process gas stream by the screen element. A pressurized air jet cleaning system may be provided so as to direct pressurized air jets against the surface of the screen element to dislodge particulates therefrom, the pressurized air jets entraining the particulates dislodged from the screen element and directing the particulates to the arcuately shaped particulate trap for collection.