The fans can be tested by measuring airflow through an unobstructed tunnel, and measuring pressure in a fully obstructed tunnel. As a stretch objective, testing multiple levels of obstruction would allow the generation of a complete flow vs pressure chart.
I will create a test tunnel using a PVC pipe with a fitment for fans at one end and a gat at the other.
To measure the flow, I will use a couple of approaches and compare results;
Anemometer placed at intake of tunnel
Ram/Static annubar inside the test segment
Manometer for differential pressure is on order
This setup will also be used for static pressure testing, with one line switched to ambient pressure
Flow restriction will use a blast gate for open/shut functionality. Variable restriction is still undetermined: I could use a 3D printed iris mechanism, or something COTS.
Noise measurement will be accomplished with a acoustic dB meter, since my lab does not (currently) house an anechoic chamber, these values will be approximate and subject to a fairly high noise floor. I don't expect to be able to measure a noctua-grade noise level in my lab.
Fans will be driven with a generic amazon fan driver board. Future development of a dedicated driver with a teensy, fan controller and the ability to monitor fan speed vs pressure would be a good development.
What to do with the resulting data is also unknown. If there is community interest, results could be shared via a public-accessible google sheets, or a dedicated webpage.
Nearly all of the parts I need are commodity or simple 3D print designs, I expect quick progress with construction.