To determine hours for aerating a grain in a bin, you need to know the cubic feet per minute of air per bushel (cfm/bu) a fan is providing. Aeration hours for cooling grain to ambient temperature is typically 15 divided cfm/bu. For a very rough determination of cfm/bu you can use an air flow meter (anemometer). Take several air speed measurements at the grain bin fan intake, as indicated in the directions on the “cfm/bu calculator using anemometer measurements”. Enter them into the spreadsheet to automatically calculate cfm/bu. A static air pressure gauge (manometer) would be better, but this method with an anemometer can provide some basic information if you do not have fan performance documentation or an anemometer.
blogs.cornell.edu/…/cfm-per-bushel-calculator-using-an-anemometer.xlsx
