Need suggestions for a good cheap exhaust system....

Hey guys! I need some help finding a good cheap exhaust system for my 24"x24"x56" grow tent. What tould you guys recommend?

I was looking at either this one....
https://www.amazon.com/gp/product/B00D7M6692/ref=ox_sc_sfl_title_1?ie=UTF8&psc=1&smid=AXC6VLRHTOFD2

OR this one maybe....
http://www.ebay.com/itm/4-Inline-Exhaust-Duct-Fan-Air-Blower-Carbon-Filter-Kit-Odor-Control-Scrubber-/191114755011?hash=item2c7f53bbc3:g:wz0AAOSwal5YJacX