These values are for airflow rates of 100 to 150 cubic feet per minute per square foot. To keep kernel temperatures below 120 degrees, Fahrenheit, reduce drying air temperature 10 degrees for an airflow of 50 cubic feet per minute per square foot. In all cases grain nearest the heat source is most severely damaged.
Durum is very sensitive to dryer temperatures.
With higher drying temperatures, the percentage of specks in the processed semolina increases. Since the burner of a dryer cycles on and off, it's safer to use a temperature lower than 130 degrees.