Product name: ventilation grille Material: ABS engineering plastic steel material Double-layer air outlet size: 500*130mm, 600*130mm, 700*130mm, 800*130mm, 900*130mm Air return size: 1540*170mm, 1210*250mm, 500*200mm, 600*200mm, 700*200mm Applicable places: home/shopping/hotel, etc. Installation Notes: 1. Because the thickness of the ABS tuyere is 4.5cm, you must ensure that the depth of the hole is above 4.5cm. 2. Because the frame of the tuyere is 2.5cm, so you must ensure an installation distance of 2.5cm around the opening. 3. We use the inner diameter as the standard to customize. Please be sure to provide the precise opening size. The inner diameter (length x width) of the tuyere will be slightly smaller than 5-10mm for the convenience of installation. About size: The product size is manually measured, there may be an error of 1-2CM, please refer to the actual product Regarding color: due to different monitors, a slight color error may occur. For more information, please refer to the actual product. The arrival time of the product is about 15-30 working days. Thanks for your patience. If you have any questions after receiving the package, you can always contact us via email! We have more high-quality products for you to choose from! Welcome!