what should i buy?

i ordered my grow tent today and im just waiting on its arrival and i was wondering what should i use for a ventilation system for this tent? looking for somthing cheep to not somthing fancy just somthing that will do the job.

http://www.amazon.com/inches-Reflective-Hydroponics-Cabinet-GYO1009/dp/B002V9HZBA/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1286028698&sr=1-1

thats the tent i ordered by the way.

Go with a 4" carbon filter setup, drawing air from the top of the tent, or through an air-cooled reflector. You're going to need odor control anyway, so might as well start off right. Right?



Something like this..... http://cgi.ebay.com/4-INLINE-FAN-CARBON-FILTER-COMBO-ODOR-CONTROL-SCRUBBER-/160485518502?pt=LH_DefaultDomain_0&hash=item255daeaca6

You can make your own pretty easy