My grow room

I have an unused bedroom 12x10x10.
I built an unenclosed 5x5x5 wooden structure, mainly for hanging a few shelves and light fixtures. I have a 400w hps system w cool tube made by Apollo. 9 plants currently 2 weeks old under CFL's. I'm waiting to sext them and only expect to end up with 2-5 females. With them I plan to take it slow, topping and training. Maybe grow 3' max. My question is with the 400w MH bulb I use for veg and HPS for flower, will there be an issue within my grow room. I do not wish to have ducts and fans going in and out of my house. I have box fans for within the room and the doorway. I can leave the bedroom door open all day if necessary. Temp in the room is always 68-72.

What feedback do you have for me?
Thanks!

you need to exhaust air out of the house somehow. find a place where you can make an exhaust because it is absolutely necessary. 400 w is far far from your minimum light requirements to flower. in a 5x5, you need like 2x600w

One 400w isn't enough for 2-5 plants?
I have a 5x5x5 grow area within the room but have no intention on packing it w plants.
I'll keep them as tightly together as I can w the 400w hanging closely above.

400w can be plenty for 2 plants, all depends on your expectations. Problem will come about the 5th week of flower when it starts to reek like ganja if you have no exhaust, maybe even earlier. All that stank has to go somewhere.

My place wreaks of dank all the time anyway. How bad are we talking here? Next door neighbors smelling it in their kitchen bad?

My place wreaks of dank all the time anyway. How bad are we talking here? Next door neighbors smelling it in their kitchen bad?

I love it, I have two in flower and they are in a bathroom on the other side of my house - when I wake up as soon as I walk out of my room its like the entire house has the smell of fresh MJ, its awesome.