An average of 12 hours using the coolest and driest air of the day is common. This removes harvest heat and evens out temperature and moisture, avoiding hot spots and moisture damage. For longer term storage, aeration fans are run for a few hours when needed. The amount of cooling achieved during storage depends on the moisture content of the grain and the humidity and temperature of the incoming air. Seek advice on fan operation times from the equipment manufacturer or Agriculture Western Australia.
Aeration advantages Lower temperatures allow moist grain to be stored safely for longer periods.
Even temperature of the grain mass in the silo prevents moisture migration. Hot spots are prevented from developing. Mould growth is slowed and insect development is reduced dramatically. Cool stored seed retains its viability and vigour for a longer period. Use dry, cold air so that moisture levels are not increased and fit a controller that responds to temperature changes.