I am in Texas as well and have 3 Antminers and 2 Pangolin M3s which I think equal about 75 S9s Anyway you're thinking about cooling incorrectly, what you need to think about is removing the waste heat. I made a thread called ducting check it out. The goal is to simply get the heat out of the garage. By doing just that I reduced the temp approx 30 degrees. Even the brutally hot M3s are staying pretty even.

Also your CFM requirements are waaaaaay too low. Figure around 225 CFM per miner! S9s are around 5000 BTU each, these M3s are over 6000.

Garage temp at the time of this pic was ~ 75 deg F. If I had a fresh air source it would be even better and possibly help cool that HotFlash M3... But this is just a temp setup until I find a suitable building.

https://i.imgur.com/jqKX0D8.jpg

Here they all are in their temp duct arrangement

https://i.imgur.com/NR2Ekgg.jpg

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(Moderator's note: This post was edited by frodocooper to trim the quote from mineintx and to remove inline image tags.)