Yes, grinderz, there's a fan. Actually, those pics were taken when the station was located next to my chimney, and had one 6" duct booster fan stuck in the hole where the old oil furnace used to be ducted. I've since had to relocate the station. Now it uses the same duct booster fan to blow up a 6" duct that runs through a closet on the first floor and into the attic where a 2nd duct booster fan helps out by pulling smoke up.
You can find the fans at Home Depot for ~$26.
If I were computer saavy enough, I'd post the drawing for my new cooler. All it is is a box 12"w x 20"l x 30"h, with an angled baffle. An 8" fan that can be bought anywhere sits on the bottom of the box w/ the round part of the fan stuck in an 8" hole in the baffle, blowing out the front of the box, which is cut away and replace w/ window screen. What I like best about the cooler is its simplicity, and $12 overall cost.
If somebody can give me a clue as to how to draw and post the above ramble, let me know so I can start a new thread and not hijack this one further.