Originally Posted by grolog

Long time reaaadaaaa, first time poosstaaaa....

Or maybe second time.

I know there are a ton of questions like these among the forums - so many so that it's difficult to find threads that are 100% relevant to the questions I have... so here I go.

I'm using my walk-in closet in the MB of my house - plenty of room inside, and the standard size of a walk-in closet. I have a cabinet with a CFL grow - top light, two sets of side lights, and a 400w HPS for flowering.

I'm not too concerned about the heat produced during the veg (CFL) stage because I have an A/C vent going directly in to the room - however, I'm curious about intake and exhaust when the 400 watter is running.

My first and most pressing question - how do I clean the air that I'm taking in?

My closet is attached to my master bath, where I shit, shower and shave on a daily basis. Surely some molds and other bacteria will be afloat and aflutter in the air - and I'm sure I need to keep these (and the excess moisture showering causes) away from my baby girls. Will a carbon filter handle microbes on an intake as well as it does smell on exhaust?

My second question - how much exhaust do I really need? At this point, I don't plan on using the CFLs and HPS concurrently, but I'm sure that will change. In a 10'x10' room, how much heat will both produce? How much CFM (excuse me if I'm phrasing this question incorrectly) do I need on intake and output? Just general numbers will be fine, though if there's a formula to be pointed to I'd be most grateful (teach a man to fish, and whatnot).

Thanks for answering - pleasure to be a part of the lurking community at RIY!