So. Since buying two fans from Ac infinity I have ended up with 3 different controllers. So i figured out the variable speed dilemma. I plugged the analog controller into my intake to always take air in and my controller 67 I plugged into my 6 inch exhaust. Maybe i can cool it better this way. I am unable to turn my lights up to where they need to be for veg. I am planning on buying a tripp lite air conditioner to duct it into my tent. But until then just experimenting. This is my first grow BTW.