Need advice on closet veg area with no ventalation

So Im thinkin of setting up my veg area right in my flower room. Its a 2 x4 or 2x5 and I just plan on using a few cfls for light. Im going to do about 8 clones in a clone tub at a time and (2) 5 Gallon buckets with 3 plants each just starting to veg leading into flower every two weeks. Now I having an issue trusting not having ventilation. See during flowing time the entire room will be opened up but when it nap time for the mommas Ill close off the closet for 12 hours. Now my question is will these plants survive 12 hours a day with no ventilation for fresh air. I dont have the money for can fans or the things to do this proper at this point so Im wondering if anyone with experience did fine in a situation thats similar. Thanks in advance for your posts.

I have done the same thing when I first started up and yes they will survive. But if I were you I would buy or find a old pc fan "these are very cheep" and use that. Your plants will be better if you do so