Does a single plant need an exhaust vent in closet??

Closet is like 3.5 x 3.5 led is 200w I got fans it's not over 80 in the closet I air it out a few times a day I keep my crib cold.. I got solar.. it doest feel stuffy...

A single plant would want the same as many plants. Having a fan to air exchange is ideal. Your plant will double in size once it hits flower ing stage and as buds begin to fatten increase humidity. I can go on and on. Set up a fan to exchange the air, it’s going to help you control the space better than without

My 4 week old veg says... Yes.

Absolutely

You'll be amazed at how much humidity a single plant will produce.

Jroey said:

Closet is like 3.5 x 3.5 led is 200w I got fans it's not over 80 in the closet I air it out a few times a day I keep my crib cold.. I got solar.. it doest feel stuffy...

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A single plant in a 4x4 space (roughly) does not need an exhaust fan if temps are under control.
I tell you this from actually growing in a closet without one at a friends house.
His first grow and a true beauty.
It loved the space and never an issue from seed to harvest.
Yes, it's always good to have exhaust, but it's not always possible or needed.

Jroey said:

Closet is like 3.5 x 3.5 led is 200w I got fans it's not over 80 in the closet I air it out a few times a day I keep my crib cold.. I got solar.. it doest feel stuffy...

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The issue is not temps, its the humidity. Especially at night when temps drop and humidity spikes. Mold is no fun