One of the most common applications for the grain cleaner is when a farmer is looking to do some light cleaning of a healthy crop where they are trying to cut off about 5-10% from their original sample. The 5-10% that gets cleaned out will then be fed to livestock for example, and 90-95% of the sample will represent the clean grain that will be used by farmer's discretion. The red mark on the cleaner represents the cut off area between the "clean" and "dirty" grains which can be adjusted by the 5th lever displayed on the exhibit.
Fan speed or air flow can be regulated using a Variable Frequency Drive (VFD) which controls the RPMs on the fan.
Depending on weather conditions, grain type and desired capacity adjustments to the fan speed will need to be made on a case-by-case basis.
Remaining adjustments can be made using the levers on both the front and the back of the machine.