Aeration that provides more than 15 litres of air per second, per tonne of grain can be used to reduce grain moisture content by a few percent. The risk of using less air (smaller fans) is that moisture will be pushed partway up through the grain but not all the way out the top of the silo. This leaves a band of even higher moisture grain susceptible to mould and insect attack. For more information about aeration drying and how to manage fans for drying, see ‘Dealing with high-moisture grain’ or ‘Aerating stored grain, cooling or drying for quality control’