Thanks to everyone for the quick response! Based on the input, it looks like a 6" or 8" Vortex should do the trick! I may go with the 6" to limit noise since I don't have much duct to push through (maybe 20 feet or so....).

So here is my next question: if I go with a 6" 449 CFM fan, what size carbon filter can I use? I see MAX CFM and MIN CFM ratings on some of the filters, but that doesn't seem to "tick-n-tie" with the actual CFM rating. Is there a rule of thumb? Can I use a 449 CFM fan to exhaust with a 200 max CFM carbon filter?

I ask because I'd rather spend the money on one "better" fan than two. If I can pull through the filter, then through the light, then vent with a single fan I'd have some extra moolah for other stuff. Thoughts?

BTW: I use an Ozone generator to manage smellies as well, but I only run it for 15 minutes per hour.
sneekymofo Reviewed by sneekymofo on . New Setup - Ventalation Advice I've been growing with mixed results for a while now, and I have decided to upgrade from my micro-grow (150w HPS scrog - 2 plants per DWC 5 gal bucket) to a 600w HPS (1 plant per DWC 5 gal bucket). I know I need to upgrade my ventalation situation. I have the following questions: 1. If I use an air-cooled light, what size blower would I need to ensure that the heat from the 600w is exhausted from the room? 2. If I use another fan to extract residual heat and stinky air, can I just use a Rating: 5