I've printed a this Bladeless fan https://www.thingiverse.com/thing:2869887 and than found spare 120mm fan, so I've disided to made custom case stand to check 120mm airflow.
Result: 120mm fan version it much worst in my case with 1600RPMs fan. So don't waste your filament unless you have a really good 120mm fan with big RPM number.
P.S. If you'll decide to print it please note that you may need to adjust top 80mm part. Print some small top peace like 1 or 2 mm height, place it on your fan's top part and ajust dimensions for perfect fit. In my case printed top part has not square dimmensions.
P.P.S. Placing a copy of fan holding dots in 80mm area will be a good idea too.
P.P.P.S. Added additional 120mm fan 2200 RPM at low level. Airflow looks like single 80mm version with 2600 RPM fan, may be bit more. But whole set is too unstable and sounds too loud.