so i build a carbon scrubber and the setup in my opinion is as good as it gets for a home made one. but my main question is if my fan is strong enough to actually work. i have this fan : Holmes 4'' Mini-Fan: Heating, Cooling, & Air Quality : Walmart.com i took out the shields so its just a 4 inch diameter fan that sits at the buttom of my scrubber. i dont have anything restricting. its just a circle cricket cage with screens around it so its perfect!. I really cant tell if its working great but i can tell the difference when i walk into my room. my plants are vegging but i dont wanna start flowering it and have it start to stink because the scrubber doesnt work. then its too late. i have 2 of these fans and like i said one of them is inside the scrubber like this : scrubber ->fan->4 inch duct. could i add another of the same fan somewhere after the fan inside the scrubber? im pretty paranoid about this because i want to start flowering. sick of vegging for 3 months now this grow is in a little 1x1x6 movable closet type of thing. the front is completely open so i have card board cut out to the shape as a "door". its not perfectly sealed so im sure that doesnt help with the suction of the scrubber. any other ideas i can use as a door? maybe a tarp? see its hard because this frame is metal and it has like a vinyl type of material that surrounds it. i hope you guys can picture it.