Are my plants getting enough air at night?

I have a tent with a powerful exhaust fan sucking air out. When the tent is closed all the walls suck in so its definitely getting negative pressure. At night I close the tent and all my doors and windows in my room. My question is, at night (with tent, doors and windows closed), are my plants getting enough air?

Sure. That neg pressure shows you air is getting in, otherwise it would implode. Isn't there an open intake area onit?

I also keep a fan oscillating in my tent 24-7. You should keep the tent closed all the time if you can. If you leave it open, odor will get out even with a filter attached to the exhaust.