Question about c02 systems with grow tents.

So I'm looking to invest in a c02 system.
Problem is, every grow that I've seen with c02, is growing it in a room.

I have 3 tents in one room, that I keep closed... one for clones, one for veg, and the other flower.
Would the c02 penetrate my tents if left in in the corner the room, or will I have to keep it in just my flowering tent?

If not, are there way to disperse it into different tents?

I'm new to the whole concept, so if you see that im misinformed anywhere, say something.