6 inch ac infinity will run around speed 5 and be virtually silent, when paired with controller 67 you can set high and low point triggers, min and max speeds, control both temp and humidity dynamically,
often the problem isn’t the temperature but the humidity and having a larger fan paired with a heat source can keep your conditions optimum.
less noise and more stable parameters for a little bit more money is a no brainer for me
the difference between the t series fans and the others is not the fan itself but it’s controller, get the cheaper one and buy the controller 67 separate and use the app on ur phone, controller mounts on ur tent, really slick, ergonomic design to everything can’t rate them highly enough to be honest