NOVELTY - A fiber-enriched fraction and a fiber-reduced fraction are generated from a processed grain product starting material by classifying the grain product into a lighter fraction and a heavier fraction, and separating by size the lighter fraction into larger particle size and smaller particle size subfractions. The larger particle size subfraction is enriched in fiber, and the smaller particle size subfraction is reduced in fiber.    USE - The method is used for generating a fiber-enriched fraction and a fiber-reduced fraction from a processed grain product, e.g. Distillers Dried Grains (DDG) or DDGS, starting material. The fiber-enriched fraction can be used to an ethanol production plant as an additional useful product, and to prepare valuable products, e.g. corn fiber gum and corn fiber oil. The phytosterol-containing oil in the corn fiber (corn fiber oil) has potential use as a natural low-density lipoprotein (LDL) lowering nutraceutical. The fiber-enriched product can also be useful for dietary needs or as a laxative. The fiber-reduced fraction can be used as a feed product to non-ruminant animals and help maintain the supply and demand balance of the commodity.    ADVANTAGE - The inventive method improves the economic value of grain products.    DETAILED DESCRIPTION - Generation of a fiber-enriched fraction and a fiber-reduced fraction from a processed grain product starting material comprises classifying the grain product into a first fraction and a second fraction, where the first fraction has a lighter material and the second fraction has a heavier material reduced in fiber relative to the starting material; and separating by size the first fraction into first and second subfractions, where the first subfraction has a larger particle size and is enriched in fiber relative to the starting material and the second subfraction has a smaller particle size and is reduced in fiber relative to the starting material, thus generating a fiber-enriched fraction and a fiber-reduced fraction from a processed grain product.    INDEPENDENT CLAIMS are also included for:    (1) a method of classifying Distillers Dried Grains with Solubles (DDGS), comprising elutriation of DDGS to yield a lighter fraction enriched in fiber and a heavier fraction reduced in fiber;    (2) a gravity elutriation device for separating fiber from a processed grain product, comprising a vertical flow column, an air inlet connected to the column, a blower operatively connected to the air inlet to introduce a fluid flow of air into the column, a feed inlet connected to the column at a point located above the air inlet to allow the fluid flow to act as a force on a substance passing from the inlet into the column, a feeder operatively connected to the feed inlet for introducing the processed grain product, and a lighter fraction collection reservoir disposed with respect to the column to receive a portion of the product;    (3) a fiber removal and harvesting apparatus comprising a fluid-flow classifying device, a sieving device, and a conveyor for receiving an output from the classifying device and transporting the output to the sieving device;    (4) a DDGS composition comprising a fiber content of less than or equal to40% (preferably less than or equal to5%);    (5) a feed product or feed product supplement digestible by non-ruminant animals comprising processed DDGS where the DDGS has a fiber content less than or equal to10% (preferably less than or equal to6%);    (6) a method of modifying ethanol production to integrate a DDG or DDGS fiber removal process, comprising classifying the DDG or DDGS to yield a lighter fraction and a heavier fraction, sieving the DDG or DDGS to yield a larger particle size fraction and a smaller particle size fraction, characterizing the lighter fraction, heavier fraction, larger fraction, and smaller fraction regarding fiber content, and removing the lighter fraction, heavier fraction, larger fraction, and smaller fraction characterized as having enriched fiber content relative to a starting material, thus modifying ethanol production;    (7) a method of processing a DDG or DDGS starting material, comprising determining whether a first processing step should be a procedure of classifying or separating by size and a second processing step should be the procedure not chosen for the first processing step, and selecting a classification parameter or a sieving parameter depending on the determining step; and    (8) a method of processing a fiber-containing agricultural product comprising air classification, thus yielding a processed product, where the classification step provides an output material having a neutral detergent fiber separation factor of greater than or equal to1.    DESCRIPTION OF DRAWING(S) - The figure is a flowchart of fiber removal process with sieving then elutriation.