This is my simple and cheap recipe, your intake on the channing is 2-1/2" in diameter and is 12" off the floor, use the 4" side of a 4" to 2-1/2 PVC reducer over the fan intake, add to that a short piece of 2-1/2" and then a 2-1/2" tee,on the bottom of the tee put a threaded piece like a compresion fitting to contact the floor, put this together so when the compresion nut is screwed all the way on it will fit between the blower and the floor then unscrew the nut and it will snug it up to the blower housing,
From the side of the tee a 2-1/2" to 2-1/4" female thread coupler screwed onto a 10' lenght of galvinized flex exhaust hose from a truck parts store, that fits nicely into a chain link gate post 5 or 6 feet long that goes through my basement wall, on the outside I use a 2-1/2" pvc elbow turned down,with a small piece of ratwire to keep the varmits out.
All this is clear as mud, I am sure, read it a time or two, everything goes together easily...
P.S. In the summer when it is unhooked you can talk into it or yell 'help', it really drives the neighbors nuts,they can't tell where it is coming from. They think the place is haunted!