Here would be my strategy if I wanted to fill the guts of an endless breeze fan with computer fans.
I would have 3 NF-f12 3000 Ippc industrial Noctuas (120mm)on the NA-FC1 speed controller. It comes with a 3 way splitter to power and control 3 fans, and you can run each yellow wire(+) to your Alpha and Omega military switch and control them separately.
These three fans can move 330CFM for 0.9 amps, and with the speed control, one can dial them all the way to dead silent and almost no air moved and amp draw under 0.03, for all three fans.
Keep in mind that 110cfm per fan is at 12.00volts. It is obvious they spin significantly faster when I plug in my powersupply and push system voltage upto 14.7, and the generaly high voltage that a lifeline AGM holds during discharge will have them beat their ratings.
With the speed controller I see no reason to switch all three of these fans separately though, as at minimum speed One can almost count the number of rotations of the impeller by eye and the amp draw is so low as to be hard to measure. The noctua speed controller has a button. If the green light is on then with the dial all the way on low the fans will spin at their absolute minimum rpm. press the button adn the light goes off and they will stop spinning completely, and the amber light stays on, and I cannot measure its amp draw.
The whole range of speeds inbetween minimum and max will allow for maximum function and efficiency, at the spin of a dial.
The Noctua NA-fc1 speed controller measures about 1.5 inches long, one inch wide and half an inch thick. the knob for the potentiometer is about 1/4 inch in diameter. It is much smaller than the pictures led me to believe.
I consider the fan controlling thermostat, to be in the same league as the 50 cent logic chip controlling a smart charger. I'd prefer to choose the flow, by spinning a dial. But yor fan, your call.
The fourth fan, amp draw and noise no problem, would be the 252 CFM screaming banshee Delta fan. Put it on the bottom as it will likely tip the endless breeze fan over if up higher. This fan redefines powerful. It will chop off a stray fingertip, and putting a 120mm wire grill close behind it does significantly reduce flow and increase its noise, but it basically has to be there as it will suck in passing children into it at 12v, and at 14.42v you should probably lean away from it if walking behind it.
If you have 3 industrial NF-f12s at 3k RPM each and the 252 cfm and 5400 rpm, you are looking at a Beast of a fan, that will consume just under 4 amps. 582 cfm at 12.0 volts.
Turn off the Delta fan and with the noctua speed controller you can control flow from ~ 30 cfm to 330 cfm, 0.04 amps to 0.9 amps.
The noctuas while loud at 3k rpm, are not as high pitched annoying as other fans with the same decible rating
The delta screaming banshee 252cmf monster is rated at 3.82 amps but it settles in the 3 amp range once at speed and at max speed one might have issues hearing a nearby Sikorsky in heat.
I use my screaming banshee in my workshop, and at 7 to 8 feet away from it, and it is like a 20Mph breeze in a 4 foot column hitting my body, and or simply used to blow away dust that i am at that moment creating. That is likely at just under 12 volts with voltage drop on my wiring to it, and with a finger guard in place. If I got earbuds in listening to music it is great. If I have my earphones out and am outside the workshop 100 feet away, I can hear it, easily.
The regular noctua NF-f12 is 1500 rpm, moves 53 cfm for 0.05 amps. Its price is only slightly less than the industrial 3000 rpm Noctuas NF-f12's. It is exremely efficient, but 1500rpm/53 cfm is not a huge volume of air, though the hub support does concentrate the flow pretty nicely in a column, but not to the same degree as the spiral hub supports on the higher rpm Delta fans.
I do not have a tach and am not willing to dismount my nf-f12s for an subjective test of airflow and compare amperage readings, but the 3 phase motors of the Noctua industrial fans are claimed to be 10% more efficient, and no other 120mm fan comes close to the NF-f12 in terms of air moved for amperage consumed.
Throttling the screaming banshee 120mm Delta fan via PWM on the fourth wire can be done, I just have not pursued it to that endpoint. One youtube video shows one guy was successful doing it, although I do not know the amp draw when slowed to tolerable levels.
Looks like this fan is also relabelled, but I would prefer the delta name brand sticker on teh hub.
https://www.amazon.com/TFC1212DE-5200RPM-Bitcoin-Powerful-cooling/dp/B076M7CT63/ref=pd_lpo_sbs_147_t...Noctua does make the 140MM fans, but their amp draw for air moved is not as impressive as the 120MM nf-f12, and multiple 140MM might not fit all that well in the endless breeze casing, and I have no personal experience with them. But generally bigger fans, mean more air moved for less noise. They do have step down rings to use 140mm fans in 120mm applications,so one can likely offset the 140mm fans and fit them into the endless breeze case with these step down rings.
Depending on what one can actually fit in the endless breeze fan, the Silverstone 180Mm fans are a good performers too, but the AP182 does not like max speed at battery charging voltages, the hub gets stinky plastic hot. Its spiral grill concentrates the flow nicely, but is also fairly restrictive, and that is why I believe the 700 less rpm of the fm181 (at 0.29 amps)comes within 15cfm of the Ap182( at 1.3 amps and 2k rpm). Both are rated the same airflow at minimum speed, 65 cfm, but the Ap182 does it for 0.05 amps and the fm181 consumes 0.09.
A 180Mm fan with several 80 MM high rpm delta fans surrounding it could also meet your requirements.
I have cut off the spiral faceplate of my failed silverstone Ap182 and attached it to my fm181, not for the concentrating flow, but as a finger guard. The flow through it is less with the grille in place. I've considered removing some of the spiral arms to lessen restriction, but likely will not ever bother.
If i were to redesign my intake fan shroud from scratch, I would likely use 2 fm181's side by side and a single 3K rpm noctua 140MM fan.
But the 3K rpm 120mm noctuas have higher static pressure rating and likely force more air into the van if I do not have a window open. My ceiling exhaust I estimate at 150 cfm max, and the intake fans would push some 380cfm without any restriction behind them.
If my side door is cracked, and I have all my fans on high intake and exhaust, air is spilling out that crack. I can feel it from 4 inches away.
Now if i were to have the screaming banshee fan also assisting the other intake fans, you would hear manicial laughing even from across the border.
