Hi to every one
As a ROT (Rule Of Thumb) it is said:

2.4 GPM/Ton cooler water flow.

400 CFM/Ton air handling unit air flow.

3 GPM/Ton cooling tower water flow.

(??) CFM/Ton cooling tower air flow.

This last ROT is unknown for me.Though there is many reservations about the the accuracy of ROTs. I see that ROTs are a Course approaches versus Fine approaches of calculations.Tough... they facilitate fast evaluations and views. I will be very thankful to answer me and any additional help for advance.