Delta Electronics DC Axial Fan 24v 1.63a Brushless PFB0824DHE
2nd photo shows the specs of this fan. These go for $20 online but we have them for just $5. These were salvaged from battery packs and are guaranteed to work like new. This is a legitimate fan, puts out a lot of air, and is trusted by very popular brand battery makers.
You'll be a big fan of this fan (pun intended)