metal or plastic grille rounded or rectangular shape ductwork leading to the vent a fan or motor attached to the opening a damper or control switch to regulate airflow insulation or soundproofing around the vent
vent which has metal or plastic grille vent which has rounded or rectangular shape vent which has ductwork leading to the vent vent which is a fan or motor attached to the opening vent which is a damper or control switch to regulate airflow vent which has insulation or soundproofing around the vent