Abstract: The present disclosure discloses an air filter that is easy to replace and install, the air filter including edge strips, corner connectors, and a filter element, wherein the edge strips and the corner connectors are connected to each other via mortise and tenon structures to form a frame; and the filter element is fixed within the frame by means of a connection member, the filter element has a plurality of pleats parallel to each other, and flexible cords are provided between adjacent pleats on at least one of an air intake side and an air discharge side. The air filter of some examples of the present disclosure can be conveniently disassembled in situ, and can be disassembled into components during storage and transportation, thereby reducing the space occupied during the storage and transportation, and facilitating the reduction of the cost of storage and transportation. The frame can be reused, thereby producing less waste and being more environmentally friendly.

Abstract: Nanomaterials (100) in particular HEPA air filter media. One embodiment is a nanomaterial (100) that includes a plurality of nanofibers (140) that form a randomly interwoven network defining three-dimensional pores (160) therein. The nanomaterial further includes a plurality of beads (120) with a bead diameter of 2-20 ?m that are distributed randomly within the plurality of nanofibers (140). The beads (120) support the nanofibers (140) to prevent the pores (160) from collapsing.