Ender-3 and Novice Upgrades: Third Upgrade (Fan + Hotend + Electronics)
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The third upgrade is definitely a hot end fan and a motherboard cooling fan. But here it is worse.
Hotend which has Ender-3 and Ender-3 PRO is not one of the best.
This is mainly due to a small heatsink.
Due to its size, strong cooling is required.
I recommend any 24 V axial fan with air flow above 10 m³ / h and dimensions 40x40x10 to 40x40x20. The same applies to the motherboard blower.
Very good fans are manufactured by SUNON.
For smaller sizes, you have to count with more noise. Many can be obtained from Aliexpress, but not all will last more than half a year.
It depends a lot on the manufacturer and on the type of mounting rotor part of the fan.
Higher but noisier fans use bearing arrangements. They last longer and can be placed in a tilted position.
Cheaper but quieter fans with sleeve fit. They last longer in an upright position and do not like movement.
I have a good experience with these 40x40x10 .
Unfortunately, it is not one of the quietest and if they have something to endure, it is necessary to reach for the more expensive variant, or remove the cover of the hotend and print another holder.