You don't say if the fans are mounted in series or parallel. There are CFM calculators on the net.

Noise measurement is less straight forward.

Perhaps more details? Is this theoretical or practical?

This is a practical application. The Fans would be mounted in series.

Virtual Airflow Calculator

See if this helps.

You can worry about the noise later. It's much more complex. So complex that actual measurement will be the only way to get a number.

I'll give it a shot...

Thanks

I believe that you will find that air is more efficiently pushed, than pulled, in a quasi-open system.