Exhaust Fan in a Freezer - Recommendations

So I have a 16 cubic ft upright freezer...

My question is what size/type of fan do I need ?

I am actually going to blow it out a "cat door" that is in one of those little cellar windows.......

Plant is skunk...I'm thinking I may use a homemade carbon filter at some point but I am not 100% sure on that yet......I was thinking it could help heat my cellar in the winter time....At the same time I am on a budget here...

Other than that do I need a carbon filter ? If I blow it outside the closest neighbor is about 250' away and through the woods.....

I guess what does everyone think I need for a fan with a carbon filter ? And what type of fan would I need without a carbon filter ?

Any suggestions/recommendations are appreciated....thanks

OK, I just talked it over w/ the gf....We dont think the smell should reach the neighbors house...So I am not foreseeing a carbon filter.....

Just a duct and an inline fan.....Anyone know if this one should do the trick ?

http://www.homedepot.com/buy/building-materials/heating-venting-cooling/inductor/4-in-inline-duct-fan-62960.html