Pneumatic grain conveyors could also be used for filling and emptying flat storage. Grain moisture . Because it is difficult to achieve uniform air movement in flat storage, it is difficult to dry grain adequately in these buildings. It is probably best to make sure grain is dry enough for storage before placing it in the building. Even if grain is dry when it is moved into flat storage, it should still be aerated so that you can control grain temperature to reduce mold and insect activity and to prevent moisture migration.
Perforated ducts placed on the floor can work well for flat buildings.
If the pile is fairly level, duct spacing should be about equal to the pile depth. If you have a long triangular-shaped pile, you might get by with one duct, centered under the peak, running the length of the pile. Ordinary plastic drainage tile doesn't work very well because it doesn't have enough perforated area for good air movement. Try to keep duct lengths to less than 100 ft to reduce problems with non-uniform air distribution. You can minimize condensation problems by providing plenty of air exhaust area and plenty of air movement over the pile while the fans are running, and by running the fans often enough to minimize the temperature difference between the grain pile and outdoor air.