Abstract: Various embodiments of a filter are described herein. In one embodiment, a filter includes a first side and a second side both of which have openings therein. A plurality of baffle members are positioned between the first side and the second side. The plurality of baffle members may be provided as separate pieces or as part of a baffle element. The filter may be used to remove grease from cooking exhaust in residential or commercial kitchen environments. In another embodiment, the filter includes a first side which has a plurality of entry openings in it and a plurality of baffle members which define a plurality of exit openings where air exits the filter.

Abstract: A separation cartridge is disclosed which comprises a first separation medium, a second separation medium, and a frame. The second separation medium is positioned adjacent to the first separation medium. The frame is configured to hold the first and second separation mediums. The separation cartridge is configured to separate one or more entrained substances from a gas stream in a hood system.

Abstract: A separation cartridge is disclosed which comprises a first separation medium, a second separation medium, and a frame. The second separation medium is positioned adjacent to the first separation medium. The frame is configured to hold the first and second separation mediums. The separation cartridge is configured to separate one or more entrained substances from a gas stream in a hood system.

Abstract: Particles may be used to filter oleo material such as grease from a flow of fluid such as a gas. The particles can be arranged into a bed to filter the oleo material from the fluid. The filtrate substance collect on the inorganic particles. The particles are re-usable, in that they can be subjected to filtrate-separation techniques, e.g., solvent extraction, detergent washing, and centrifugal separation, to separate the oleo material from the particles.

Abstract: Particles may be used to filter harmful biological material from an fluid stream such as air. The particles can be arranged into a bed to filter the harmful biological material from the fluid. The particles include a biocidal agent which is used to destroy the harmful biological material.