Where can I get a fan that I can install though a floor?

I have a woodburning fireplace(insert) downstairs, its a Single story (Raised Bungolow) home, and the hot air needs to take a long path though the downstairs to find it's way up. What I'd like to do is make hole though the floor, maybe the size of a vent register to let the air go straight upstairs. I was thinking using a vent register booster, I think they come pre wired with a fan built in. thats one idea, would like to get a few more from other people maybe someone has done this before.