Stop in for a cup of coffee

I just found this on the same site.

Outboards are 500 cfm, center is 350 cfm. Measured at 4" Hg pressure drop. As opposed to 4 bbl that are measured at 2" Hg pressure drop. Divide 2 bbl figure by 1.414 (square root of 2) to get 4 bbl equivalent (955 cfm in this case).