What about odor control?

Assuming you will have a carbon filter mounted in the flower room, maybe you can just use a passive intake and passive exhaust for your clone and mother stations... Kind of hard to explain but here goes...

Make holes so that the air flow starts low in the mother room and goes up into the clone room. Make the exhaust for the clone room lead to the flower room. Then get the 8" fan + speed controller and carbon filter, and exhaust the air from the flower room. You will also want to keep one intake in the flower room, but make it a little smaller to maintain negative pressure.

Just an idea... that way you only need one fan and carbon filter. It still will depend on how many cfl's/fluoros you plan on using, and what the temps are coming into the grow room... A lot of variables but I think you have the right idea.

Something that I've learned the hard way, get the bigger fan and a speed controller. I bought a fan recommended for a 400w, and it's barely enough to keep my temps in range, and it's noisy since it has to run on full power. A larger fan with a controller gives you much more options, and will run quieter too if you don't crank it up full blast.

:twocents: