Abstract: An air filtering module for supplying air comprising a module housing having a rear plenum portion and a front frame portion united together. The plenum portion has a rear air inlet opening. The frame portion has a planar front air outlet opening and has a continuous outer perimeter wall extending substantially perpendicular to the plane of the air outlet opening. A replaceable air filter cartridge and a fan assembly are mounted in the module housing. A perimeter barrier gasket is permanently united to the outer perimeter wall. A plurality of perimeter connecting structures permit mechanical fastening of the outer perimeter walls of adjacent module housings together in an array of modules in a manner compressing the barrier gasket to block air flow between the module housings. The module housings are easily separated from a fastened condition without damage to the perimeter barrier gasket for reconfiguration of an assembly of module housings reusing the barrier gasket.

Abstract: The air filtering apparatus has a perimeter mounting frame for placement within a grid opening of a ceiling structure. Within the mounting frame is a filter cartridge having upper and lower surfaces. Each such surface has a perimeter border area. An upper assembly is removably fastened to the perimeter mounting frame and includes a plenum perimeter wall having a lower edge for pressing downwardly to form a seal impervious to air along the perimeter border area on the upper surface of the filter cartridge. A lower assembly is removably fastened to the perimeter mounting frame for pressing upwardly against at least a portion of the perimeter border area on the lower surface of the filter cartridge. Either the upper assembly or the lower assembly may be removed to permit filter cartridge replacement either from above or below the perimeter mounting frame without removing the perimeter mounting frame from the grid opening of the ceiling structure.