Vent and lighting question

yo guys n gals, moley here.
Just wondering, enclosed here is a plan to do some hardcore closet growing.

I'm using soil, not hydroponics, (not yet anyways).

Using shitty lights right now, so my plants are well over stretched.
Anyways, next week I'm going to get a 250w HPS + a 600w HPS.
Both of which can be used for MH and HPS bulbs, so when the HPS get busted, I'll swap over to MH.

Anyways, heres my plan.
Just wondering the best way to vent these babies.
Thing is, it's a closet grow room, (over 2 closets) the first one to do seedlings + vegging, the second for flowering.
These are gonna need venting as the heat will probably be unbearable for the plants, what should I do?
If I use an extractor fan for intake and outtake where shall I put the entrance / exit for each closet? Bearing in mind, they are joined together.
one at the bottom of each one and then one at the top? top for out and bottom for in?
seeing as they have double doors, I can't put them in the doors, that would just look to weird, not to mention a pain for the wiring.
Cheers!
Moley.
:cool: