Easy Installation: This Aluminum Alloy Ventilation Window is designed for stability, durability, and easy installation. It's suitable for various locations including residential buildings, commercial storage, office buildings, subways, basements, factory warehouses and more. Quality Material: The overall frame structure of this product is made from aluminum alloy, which is waterproof, Easy to maintain and structurally solid. Wall or Ceiling Vents: Our Floor Vent Deflectors are suitable for most standard ventilation systems, easy to install, and can be used for wall or ceiling mounting, Classic Louver Design: The Square register features a classic louver design, adding a touch of elegance to any space while ensuring efficient . Multi Functional Use: Grille Louvers Covers are ideal for fresh air vents, exhaust vents, and return air vents in homes or commercial space such as offices or restaurants to maintain good indoor air quality. Size Chart:20cmx20cm/7.87inchx7.87inch Package Includes: 1Air Vent Cover Note: Please allow slightly errors 1-2cm differences due to manual measurement.