4 Pack Magnetic Vent Covers, Strong Vent Covers 8x15.5inch High Strength Magnetic Vent Cover for Floor Wall and Ceiling Registers Home HVAC and AC VentsMagnetic MaterialThe cover is made of magnetic material, which can be fixed in the vent to reduce airflow into it. Suitable sizeThe size of the ventilation cover is 8x15. 5 inches, which is suitable for most standard air conditioners. You can also cut it according to your needs, making it very convenient to use. Versatile functionsOur ventilation cover is not only suitable for indoor air conditioning, but can also be used in cars, RVs, etc Easy to