How effectively a pedestal fan blowing inward can bring the outside air if kept 2 feet away from a fully open window?
While this doesn't directly answer your question, maybe you should consider a true window fan such as this one



It delivers 740 CFM, has a thermostat, is not too expensive (less than $50) and will be much more effective in ensuring the flow of outside air into the room. It's also reversible, so it can be used as an exhaust fan as well.

If you need more airflow, some models go up to nearly 3000 CFM (over 90 CMM) like this one.