Quote Originally Posted by rhizome
I'd run one fan as room exhaust, dedicate one to the lights. Go w/ passive intake. Ya don't need to worry about balancing airflow that way

You could get away w/ much smaller fans- 4" er's would be fine, and cheaper.
so both inline fans as exhaust.

Ducting on both ends of the cool tube; one with no intake (just going to a hole which is conveniently next to one of my room's a/c vents) and the other end of the ducting going to a 4" or 6" inline fan.

Then a second fan connecting to a carbon filter just for the room exhaust.

Should I consider a second intake for the room itself in the form of, lets say, a duct fan?

I'm trying to find the simplest/cleanest way to accomplish my goals.
daihashi Reviewed by daihashi on . Question about ventilation I'm planning my next grow at the moment and I had a question about ventilation setup. I've read rhizomes post about ventilation on a per room basis but it never specifically talked about what I had in mind. For my future room it will be the following. This is just a really general list of space and ventilation setup. Room Size 6'x3'x3' 400 watt MH/HPS (only 1 used at a time). Sealed room with expanding insulating spray foam. 1 6" intake Inline fan (424CFM) Rating: 5