Good fan/filter for Growlab 60?

So I have recently been splurging and now have in my possession a Growlab 60, a Kessil H150 Purple high intensity LED grow light, and a water bucket with circular air stone. However, I do not have any idea what kind of exhaust fan/filter I need for the size (2'x2'x5'3") that will enable good ventilation and absorb all odors. The hole size is 5" diameter but is drawstring adjustable. Because I'll be growing with LED, heat won't be much of an issue, so I mostly need it for circulation and odor control vs. temp control. I don't have too much left to spend after my recent splurge, $50-75 is really the most I can afford to spend...

AWEOME:

Seriously? Anybody? Help?

youve got about 20 square foot, so a 100cfm fan and filter will do, so basically any 4" fan is more than enough. cheapest i could find on ebay is this http://cgi.ebay.com/New-MTN-Hydroponic-4-Inline-Duct-Fan-Carbon-Filter-Kit-/250845894425?pt=LH_DefaultDomain_0&hash=item3a67949719 you could try for a second hand fan off craigs list or anywhere else.