Design a natural-air corn drying system for use in eastern North Dakota. The system is to use a 36-ft-diametr bin with a full perforated floor and needs to be able to handle 10,000 bu of 24% moisture corn harvested October 1. Rolfes axial or centrifugal fan(s) are to be used. Specify: corn depth, fan(s) to be used, airflow (cfm/bu) with specified depth and fan(s)