This air ventilation grille only allows the air extraction from a room to the outside by means of its 4 movable strips, as well as preventing the entry of insects or small animals. In addition, it protects the air intake at the fan drive when the fan is not in operation. Suitable for indoor and outdoor use, as its movable strips oscillate automatically when the fan is on. Suitable for wall mounting or fitting into pipes of various diameters: Ø10 centimetres, Ø12 centimetres and Ø15 centimetres. It is easy and simple to install. Available with airflow from 67 square centimetres for the smallest model, up to 115 square centimetres for the largest model. The strips are made of white ABS. Available in packs of 5 pieces or in single units.