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.
rhizome Reviewed by rhizome 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