Carbon filter is what u need to keep the smell as low as possible (top left corner), you run through your light then connect to an inline fan to pull the air out of the tent. Recirculating the air is an option if u run co2 (not to waist the co2) but u have to watch out for temperature as ur pulling hot air out and pushing it back to the tent. I'm running a 600w mh/hps (for now I have it on 400 with my digital ballast) and the temperature is never going over 83 but that's when I'm getting rid of the hot air. When I used to recirculate I was getting close to 90 even more.
As a set up u will need the following for sure:
-tent
-light (400w or up)
-inline fan
-carbon filter
-ph adjusting kit and of course a measurement device
-temperature gun to get the temp of the top leaves (helps u with finding the sweet spot way faster)
-a thermometer to see how the grow area is doing
-if u don't have enough space "scrog" is what u need. I built mine since the size I needed was not available
-couple fans to blow between the light and the plants
-booster fan to bring fresh air in (this should be installed completely separate than the inline fan setup) or u can just put a normal fan to rotate the air. (Since I don't have room mine is sitting outside and blowing through the vents)
I believe that's all u need to have a successful start.
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