Need help, refrigerartion load, air flow rate

Also posted in fundamentals but this seems like the bteer place for it.
Hey everyone let me break this down: I am designing an air conditioning system for a 450 x 450 foot building. It will be used for the storage of fruits and vegetables. The building breaks up into three rooms, each at a different temperature and humidity. I have calculated the amount of refrigeration i need in tons of refrigeration and i came out with numbers such as 1020 tons.
MY first question is, does that sound reasonable?
Also i researched and found out you should have 20 to 40 cfm per ton of produce and since there are 148 996 tons of produce in one room picking 30 (mid range) gives me a needed air flow rate of 4,469,889 CFM any ideas on what i should do?

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