intake/exhaust

Do you want more air going in and less out or less in more out or the same in and out?

Hey thanks for the reply. Before I posted this I did a search and actually read this post of yours. I understood negative air pressure is good and to acheive that you would exhaust faster than you intake? At least thats what I got by reading your post unless I read it wrong. If I read correctly then does this mean that by just creating negative pressue by exhausting only and allowing air the use other means to get into the tent? Reason Im asking is the tent im working on now is a 2.6x1.5x2.6 tent and will be used primarily for a mother plant and clones in a 24hr light cycle until rooted. Without any intake or exhaust I have beens sucessful with having health plants but my problem now is the odour is becoming quite strong. This lead to me looking into ventilation so I could try to maintain the odour in this small area before I startup my larger tent right next to it which is much bigger. With that said I bought a 4" inline duct fan at 80 cfm's as 4 inches is what fits the spots in my veg tent and want to set it up to filter though a carbon filter.

The reason I mention all of this is because when reading further in your post you explain the whole thing about filtering as well. So from what I understand, by me using a 80 cfm inline, if I add a filter to the back of the inline fan so it pulls the stale air through the filter then out the tent, It would slow the fan down resulting in the stale air being filtered longer doing a better job of controling odour than just having a filter on the ourside and blowing through it at a slightly higher speed?

I am very aware I could be very off track on how I am looking at this as I am new to this stuff altogether so please correct me. I just want you to know I have been trying to figure this stuff out primarily by myself before I start asking questions bothing others. Thanks.