Soooo, I've been looking at in-line ozone generators, and I think I found one I like.

Uvonair 12 Inch CD-In-Line Duct Ozonator

Now this may be overkill... but it fits a 12" duct, and it's not THAT expensive. Not to say $750 is cheap.

EDIT: With this big monster, could I go with something cheaper and less efficient for the other exhaust? Or do I need something as effecient?