Connector flange for 12x12 cm ducting Strong and lightweight: durable construction provides good hardness while remaining easy to handle and install. Screw hole design: 5 mm diameter screw holes with 5 cm spacing; overall footprint 12 x 12 cm and a 3 cm thickness for a secure, robust mount. Ideal sizing for airflow: round duct connection with 11 cm diameter to minimize obstruction and promote smooth airflow. Precise fit and compatibility: designed to fit 12x12 cm ducting and compatible with 12038 or 12025 fans for a snug, reliable attachment. Practical use scenarios: Attach 12x12 cm ducting to a 12038/12025 fan in a compact cooling or ventilation setup. Mount to panels, walls, or enclosures for dust extraction or air intake in workshops or electronics cabinets. Retrofit existing ductwork in small offices or hobby rooms to improve airflow with a clean, secure connection.