I have a 4x4, and I started using 2x4 inch AC Infinity fans, but recently upgraded to 2 6 inch AC Infinity fans. I have one for intake that pulls through the AC Infinity intake HEPA filter and the exhaust is going into a carbon filter. This has enough power to drop the humidity to ambient within minutes, and the tent is sealed enough that keeping humidity up is not an issue by using the humidity controller. I have a humidifier that puts rh in the tent and when it goes over, the fan kicks in and brings it to where I’m aiming for.
If you are not happy that you didn’t get the T6, you can always add the controller and have the same thing. I know most people use a passive intake, but pulling through a hepa filter and using a passive intake created a crazy negative pressure and sucked in the walls off my tent.
So this is overkill. I had pest problems and mold with my last grow. I don’t intend to with this grow. You were smart to go with 6 inch fans from the start. I like the controller so that the fan only runs when it needs to and I don’t worry about enough ventilation. With the current set up, I haven’t had to run the fans higher than 3 of 10, so it’s also silent.