I have a 24in industrial drum fan and love it. 7200cfm on high and that is 75db. No complaints from neighbors in multiple apartments as its whitenoise and don’t penetrate walls or doors that well. $2k for a 48in seems a bit overkill to me, mine was $150.
The big fans need a place for the air to go, so if you’re in a small room or have the trainer backed up against a wall and the fan will be blowing directly into the wall it might not work the best.