I have a Nevermore filter with 24v fans, would it be fine to connect them to the parts that I have circled on my Prusa MK4?
Or is that dangerous?
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So I should be fine if my charger ranges from 19-24V? Or does it need to only be 24v?
With a fan it won't be a big deal if the charger outputs 19-24V. Do you have a multimeter? Do you have a 24V source anywhere on the board? Using a laptop charger for 24V/0.1A is just way overkill. It'll work just fine though. You might also get some 24V LEDs to run off it too since you'll have all that extra current capacity.
19 is probably fine. Voltage is always a bit inconsistent so the phrase they use is “nominal”- or “more or less”