Flange diameter: 60 mm / 2.36" Inches. Outer grille diameter: 80 mm / 3.15" Inches. Flange length: 16 mm / 0.63" Inches. Prevents door slamming from the HVAC running. Significantly improves air circulation between rooms Allows the airflow to flow through the rooms, ensuring a balanced airflow. Includes insect protection net for additional protection. Easy installation, takes about 10 minutes. Requires pre-drilled ventilation hole. Material: Plastic. Color: Black. Multiple colors and sizes are available. Package contains 2 pieces
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