I have trouble with this set up.

I have the electric part solved. I connected and ran 30 S9. After a like 7-8 hours, the temperature in the warehouse was 42C (107F).
The warehouse has an exhaust of 14x14" I think of 700 CFM.
I have a window opened so air can come inside.

I read that each S9 is 250CFM~4680BTU.

In order to solve my problem, I need to install a 20.000CFM exhaust + fan.
All together, it is costing me about USD17.000.

You think it is normal to pay so much for ventilation to install 70 S9?