Set of 4 heavy-duty magnetic ventilation covers measuring 39.5 x 20.5 cm for steel floor, wall and ceiling mounts.

IMPORTANT! - For steel air vents only: not suitable for use with aluminum or plastic air vents. Please test with a small magnet before ordering. IMPORTANT! - Cover size: 30.5 x 14 cm, 1.5 mm thick, rounded corners. Please measure the face of your air vent before ordering. For other sizes, refer to image 6 for details in the SIZE CHART. Can be easily cut to size. Extra magnetic strength: Made from premium materials, our covers offer a surface magnetic force of up to 650 Gauss, ensuring a complete, slip-free seal – setting us apart from the competition. Airflow control: Effectively blocks the flow of hot or cold air into unoccupied rooms, improving comfort while directing air where it's needed. Versatile use: Ideal for home, heating, air conditioning, RV, and heating vents. Perfect for basements, furnace vents, and reducing noise in apartment buildings.