Fans are selected on what type of duty.

Standards are set concerning number of air turns in a space per hour. From memory furniture refinishing is from 6-15x an hour based on amount of product. So your basement LxWxH x changes per hour desired = the cubic feet per minute required (CFM)
Once this is known a fan is selected on performance, economy, electric service, sound rating, location and cost.

What is exhausted out must be replaced, in this case with filtered & conditioned air.

It may make you rethink any mass refinishing in the basement

zl700,
Your formula should be divided by 60 to give CFM. As is, it calculates cubic feet per hour.

Your right, I usually go with CFH, but for ease of fan selection went with CFM to explain easier and forgot the division, thanks