So I've had the new power supply Spooky is using apart to see what's doing for the cooling fan in it. Bad news/good news/good news situation.
Bad news is the fan in this new power supply (another NMB) is rated at 45dB and uses 0.58A. 45dB is about 3x louder than the one in Rick and Morty. LOUD with pretty high CFM.
Good news is the fan is on a thermal switch and seems to almost never come on, and when it does, it blows so hard the power supply is quickly cooled and it shuts off again.
Good news is the existing Spooky/Multimorphic fan I have in the pinmonk store will work as a quieter replacement, but honestly, I do not believe it's necessary to mess with this new power supply Spooky is using. Yes, the fan is actually louder, but the power supply seems to not need much active cooling and when it does, the fan's on and off pretty quickly. While playing the game, you may not even hear it if it DOES come on, and the power supply seems to not need cooling in attract mode, at least in Halloween.
We'll see how it performs as Halloween/Ultraman gets in more locations with different ambient temperatures, but my personal recommendation as of right now for the new Meanwell HRP-600-48 power supplies Spooky is using in Halloween/Ultraman? Leave them alone. Changing the power supply fan doesn't seem to be necessary for this one like it absolutely was on all the prior Spooky pins with the Meanwell SE-600-48 that didn't have a thermal switch.