I would guess you can, but one big fan will work more efficiently than 2 small ones. I can't say for certain without seeing in person.

I won't be seeing the movie. I might consider getting it on DVD. I resent being expected to pay for three films, for a story which is really only enough for one, or two at most. Peter Jackson may be telling us that this is his Middle Earth vision, and it includes lots of extra stuff that are not in the book. But the cynic in me knows full well that it's been made into three movies to get us to pay through the nose three times. If Cloud Atlas can be done in one film, so can The Hobbit. And it's not as if it's cheap to go to the flicks these days either....thirty five quid for me, my wife and my daughter is plenty. I can buy several DVDs for that money, and watch them in the comfort of my own home, without the smell of popcorn, the noise of kids and the glare of mobile phones distracting me. OK. Rant over. I feel better now.

Sounds more like the ducting isn’t insulated and you’re getting condensation. Side wall venting rarely has an issue with water leaks into the duct. Go up in the attic the next time it rains.

You can check amazon's or ebay for some units. You'll surely find a good unit at an affordable. price.