Grain Drying and Storage Fan Characteristics (Part 2 of 2)

Part 2 in the "Fan Selection for Grain Drying and Storage" series. In this video Dr. Ken Hellevang, shows and describes axial, centrifugal and in-line centrifugal fan operating characteristics for effective grain drying.
Part 1 - "Understanding Airflow Principles to Properly Select Grain Bin Fans" can be found at • Understanding Airflow ...

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What fan would I use in 15ft diameter 3panel high about 2000bushel Butler bin?

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Gsi and Brock are the same company?