Thanks, that is one I would not have thought of...

Basically the entire grow area is divided into two "stalls" of say 40 inches wide. Veg area there is a four foot , 8 bulb, T5 set up and on the Flower side there will be a 600W cool tube, HPS with exhaust fan and scrubber.

It was my thought that I'd need ventillation between the two sides to allow...well ventiallation. I had done this with grates down low by the floor and was trying to figure a way to box in the way that "faces" where the plants will be to shiled light away from plants...does this make sense?

Or would you then run duct work connected into a "Y" to suck from each zone? And if so would you recomend THAT air from the Veg area, join the main flow on which "side" of the HPS light...? In other words from outside in....

Either A: 3 foot run to fan, to scrubber, to light, to "Y" with vent from F/V

B: 3 foot run to scrubber, to fan, to light to "Y: with vent from F/V

C: 1 foot run, intake of VEG ceiling area, then run to rest of system...