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Filtration in a grain elevator ranges from a system that requires a conglomeration of six compressed-air square baghouses [below in the foreground] with almost 11,000 square feet of filter media area to a waste product bin vent [below in the background] with only 434 sq. ft. of media. Aircon also makes pressurized holding bins to customer specifications.   The grinding systems in a feed mill require smaller CAS units [below left & below right], often with screw conveyors and rotary valve (airlocks). Given a certain required filtering area, the CAS has the advantage of compactness over its cousin, the compressed-air round (CAR). On the other hand, the CAR has the advantage of a tangential inlet, which allows for some pre-filtering of the air prior to reaching the filtration bags.