Ok,so I bought a 4x4 grow tent and it has 3 vent ports in it.2 in the back upper corner and back wall and 1 in the front corner,how do I hook the fan and filter up.The sleeves are to big for either side of the fan,it says it uses 4 inch duct,thats the size fan i got.Does the fan go outside the tent????like run duct out of the tent ,then into the fan outside the tent???I am stumped,the inside ducts have like strings hanging off the end,like shoestrings,what are these for,please help