Sorry, what kind of exhaust fan do you have?Cheap little tent, got those velcro flaps with the screens. My roommate keeps closing 'em.
Though if your roommate keeps closing the vents, you might not be getting enough airflow.
Does it have some of those round intake ports at the bottom? The kind with drawstrings that can be used for an intake hose?
Side question, why does your roommate think it's okay to screw with your grow?