VENTS-US plastic round diffuser is used for supply ventilation, air conditioning, and heating. Designed for wall mounting or installation into a false ceiling. Used to arrange correct air circulation in the premises. Made of high-quality plastic (ABS plastic or polystyrene). The special aerodynamic disk valve design ensures uniform air distribution. Easy mounting with a mounting flange and a lock ring. The internal part has a sealing ring for a more tight fit. Built-in protecting insect screen.