Abby Normal misses the point again:

2000x8/60= 267 CFM infiltration from natural effects, The exhaust fan
or the outdoor evap cooler are still going to be able to over power
this even with the air flow rates established for a mere 10,000 Btu/hr
sensible gain.

That infiltration removes water vapor, so the exhaust fan can run less,
with less water consumption than an outdoor cooler which needs outdoor
airflow to evaporate water, for the same house air conditions.

Nick