Well I have several older 21 foot bins. They had 18 inch 5 HP fans on them when they were new. That was enough just for aeration. When I wanted to air dry corn later on I replaced the 18 inch fans with 24 inch fans with 7 HP motors on them.
So if your just wanting to drop in 15-16% corn and feed all winter then sell it before the heat of spring you would be fine with your 18 inch fan.
IF your going to be grinding feed all winter I would NOT use the grain spreader. All of the fines will be dropped directly on the center sump. After you grind 3-4 times you will have just about all the fines out of the center of the bin.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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