I don't know how to add pics in here, I could put one in your thread about the grow tent if you want. I also couldn't find my post about my setup, but I'll try to explain again. The fresh air enters through two vents in the bottom of my cabinet, and is sucked into the carbon filter i have suspended from the ceiling of the cab. The carbon filter is hooked to the fan, and it draws air through the filter, then it is ducted to the light hood, and then out the exhaust. So it goes: carbon filter -> fan -> air cooled hood -> exhaust.