Gravity vent grille for ducts with a diameter of 100mm, square (153X148mm). The vents open with the airflow and close by gravity when the flow stops. It features a protective mesh to prevent insect entry.

Made of high-quality ABS plastic for a long service life. Resistant to ultraviolet (UV) radiation and extreme weather conditions, such as frost. Prevents rainwater entry and heat loss. It has an adjustment collar for easy and quick installation.