ventillation

i have a grow going on in my closet that currently has a fan flowing on it but no intake or out take fan the grow is in a wide open closet that is covered by currtins so it is not airtight or anything the temps are perfectly fine but is an outake and intake fan required

It depends how warm it may get. I reccomend bringing in fresh air low, and a exaust fan up high

fresh air intake is nice for free co2 but if your temps are good then no just open the door once aday for fresh air and you're golden