my grow box is 2x2x4'tall and its in the attic. i have two 8inch duct fan, the blade are clear btw, the exhaust will be on the ceiling of my box and intake in the center on the door (i meant to put it on one of the sides but i wasnt thinking when i glued the other side on to the box, so now my only choice is the door) i been trying to think of stuff to cover but anything i use to cover will block the air flow. here are the pic of my fan, im still building the box, waiting for glue to dry in 30degree F. please help me out, any advice is appreciated.