An exhaust fan will cost you too much money, you are moving out all the heated / cooled air. I have rats in my basement and there's not a smell at all. Use a box fan with a couple layers of carbon filter pad, use Air Wick filters, the plug in type, and change out your rat bedding every 5 days. Be sure to spray down the inside of tubs with bleach water and rinse and dry when changing out bedding. Also be sure to take out the trash / old bedding when cleaning up. Also, be sure to check for dead rats if you do smell something foul. One dead rat can smell up the whole house. Also, use plenty of bedding, at least a couple inches in each tub. I found that Cypress Mulch keeps the longest with the least amount of smell, it will last up to 7-10 days, but it's a lot more expensive than other options. I just found a 'screened pine' bedding from a local feed store that is cheap and seems to be working well. doesn't last as long as the cypress so I change it out every five days. If you overload your tubs you may need to change it out more frequently, with fewer rats less often. I have 50 tubs of rats and mice and can't smell them unless I go past seven days without cleaning. I visited the rodent room at the pet store, the smell was unbearable. I'm guessing they didn't spray bleach in their tubs between bedding changes and probably overloaded their tubs.
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