Air extraction with seedlings

Hello good people. I was wondering, what if first few weeks, i dont run extraction fan but instead just open cracks on the box, to push air out ?
I have air intake, so it produce naturally to push air out of the box, but, is it enough ?
No smell and no need for carbon yet, temps are ok too.

Thanks.

The need for exhaust is to remove excess heat and humidity and bring in fresh air with it's CO2 to feed hungry plants. As long as the first two are OK and there is some air movement small plants don't need much CO2 so you're good.

Should be some air movement to wiggle the seedlings around to strengthen the stalks but I just slap them around a couple times a day to do that when a fan isn't blowing them around. Too strong air movement can dry out little plants so a strong fan on them isn't good either.

I do have air intake fan running, for extracting grow box air i turned all off. Inside fan is blowing gently on them as well.

dejvi said:

I do have air intake fan running, for extracting grow box air i turned all off. Inside fan is blowing gently on them as well.

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That'll do it. I do literally smack my babies around to toughen them up tho. They look all beat up at first but soon stand tall again. Once they have a couple sets of real leaves they are strong enough to take it.