@syntagmatic Yeah, I looked at that some, lots of 24V ballasts, and there's 10, 12, 14" vehicle radiator fans that are 24V (tho the ones I tried couldn't be PWM'd to decrease speed/noise, and a rheostat would waste power). I'm not aware of any 24V PC sized fans, but I'd like to believe a multitude of quiet, low-cost assemblies is worth exploring. I just don't have the money to continue building out designs (and honestly couldn't sway anyone even if I did- I tried).