NMB Technologiess DC Axial Fan 24v 1.75a Brushless 08038RA-24S-EA

2nd photo shows the specs of this fan. These are expensive elsewhere online. These were recovered from backup 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).