well i got my entire back wall up in the garage..sectioning it off completely..sheetrocked in..steel door hung.. just gotta chop ladies down soon..but there still growing..erhhh...anyways..once there down i can stretch the 7x7 flower room out to 11x 7 and my veg room is 6x6. i will be running floros, cfl, and a 400mh in the veg area. in the bud area will be 3 lamps @ 2600wattsHPS. i hope to have this all done up and running by the first. im banking on putting portable a/c in ..that 6'' direct intake from outside..Y'ing off to both rooms. And finnaly a master lighting controll, and 1 more new 1000watter an ballast. also another 6'' active air exhaust fan for the veg room..im still not sure how im gonna run exhaust intake..but ill have to just work out the kinks along the way.
the fresh air intake will supply plenty of fresh air for sure to your girls.. they will love it.. i am going to try to run the duct close to oscilating fans so that the fresh air gets blown around as soon as it enters the rooms.. i love the wall mounted oscilating fans so much.. they save so much space and work well...
as far as your exhaust line... using the same principle you are using to feed the rooms.. could you reverse that and usme it for exhaust?? run a duct from each room, bring the together with a splitter, and run the single duct outside or in your attic or something of the nature?? i dont know if you just need to exhaust the veg room or if you want to try to exhaust both rooms for maximum air exchange tho.. you could also run your a/c exhaust into this exhaust line.. i bet tho, if you run your lights all on an enclosed exhaust line with a larger fan, you could cool all of them enough not to have to worry about the a/c.... with a couple fans blowing air around it should stay plenty fine for the girls temp wise, and save you loot on the a/c...
this would mean you'd need 3 or 4 fans tho...
one large or 2 smaller ones for all your lights (10"/12" or 2 - 6")...
1 for your fresh air intake....
1 for your active exhaust for both rooms...