Good point. A blower fan, commonly used in cars, could pull air in from the side of the case, and blow it down into the rad.
I've looked into x-flow (aka tangential) fans versus blowers (aka squirrel cage), and the blower is far easier to get. Like I said above, it's an automotive part, so even a scrap yard would have them. I pulled mine off of my old '85 Nissan 240sx when I scrapped it. I didn't rip out the housing though, but I can easily make one out of fiberglass, or plexi, if I feel like it. Not sure about the fit though... It'd be nice if the motor was mounted inside the cage (another mod?).
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