These multi-functional vent covers can be installed on the wall or ceiling to maintain comfortable airflow and the beauty of home decoration, suitable for exhaust and ventilation in bedrooms, bathrooms, kitchens, living rooms, offices, and warehouses.SpecificationMaterial:ABSColor: WhiteHeight: 32 mm /1.3 inchDiameter: 95 x 63 mm /3.7 x 2.5 inch(Max. x Min.)Fit for Hole Diameter: 63-76 mm /2.5-3inchPacking List: 2 Pcs x Round Air VentAdvantageReliable Material - The vent cover is made of ABS plastic with a polished surface, which is strong and wear-resistant, heat-resistant, corrosion-resistant, and not easy to crack or deform. The inner cover adopts a fixed convex design and is not easy to loosen.Dust-Reducing63-76 mm /2.5-3nbsp;Vent Cover - The ventilation cover with louvered design helps reduce dust and other debris from entering the ventilation system and room, while providing ventilation.Instruction1. Measure the exact inner diameter of the hole.2. Choose the right vent cover.3. Plug the vent cover into the hole to complete the installation.NOTE1. Before purchasing, ensure the size of the hole on the wall and ceiling or your duct matches our air vent cover.2. Keep the vent covers away from direct heat sources to prevent damage. Regularly inspect and clean the covers to maintain optimal performance.