@glasspusher@beige.party Additional power controllers like that are great ways to extend the utility of existing box fan CR Boxes by letting you make them quieter. However, if quieter is the goal for a new build, I would still recommend going with PC Fans. There's no sacrificing of performance to make them quieter, so you can easily leave it fully running all the time. Plus, the cost is a wash when compared to adding on a Variac to a box fan build. I'm quite glad it's been so helpful in your implementation.