Well, its apparent that a flowbench is being used for some development. Its a custom built unit, but theres nothing “cheap” about it.
It uses 4 “Domel” brand motors, each capable of 125cfm @ 28″. Each motor that is used above the first, a loss will be apparent, but with all 4, which has NOT been fully tested as yet, should yield over 400cfm fairly comfortably.
Its a full digital setup, with velocity probes, and logging / measuring equipment. Still some refinements to be done, as with everything. But it does the job quite nicely. Its also loud as a screaming child.