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One difference between and "airslide" and a "centerflow" covered hopper is that the airslide unit is hooked up to a source of compressed air while it is being unloader. The compressed air shakes and jostles a special surface inside the car to loosen the material inside the car (such as flour) so that less is left inside the car after unloading. The centerflow is more likely to carry grain such as wheat, corn etc. before it has been milled. Gravity is the primary mover of the grain during unloading. There is no internal mechanical aid as there is in an airslide type of car.
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