Abstract: Apparatus for filtering air discharged from a cotton gin, so as to minimize the likelihood of contamination of the ambient atmosphere by airborne particulate waste from the gin. The exhaust air from the gin is fed to a housing containing, as initial filtering means, an inertial classifier in which relatively large particulate matter is screened from the air and dropped by gravity to the bottom of the housing below the inertial classifier screen, where it is collected and discharged, preferably by a compacting screw conveyor. A major part of the air along with entrained relatively smaller particles of foreign matter is passed through the inertial classifier screen.

Abstract: An improvement in air filtering apparatus of the type having means for providing intermittent reverse flow of air through the filter media of the apparatus to dislodge any accumulations of material from the filter media. Such apparatus is conventionally formed with a collecting air chamber receiving the air to be filtered, which is then fed to a filtered air chamber separated from the collecting chamber by a grid plate with air passages therethrough. Filter media such as filter bags or the like are arranged in the grid plate air passages to filter the air passing through to the filtered air chamber. The invention provides an improved air plenum blower fan arrangement providing a relatively straight reverse air flow path from the fan discharge to improve the efficiency of air transfer between the fan and the filter media to effect desired cleaning of the filter media.