Due to the thickened material, the ventilation cover will not be deformed easily, and its connection is equipped with a fixed snap to reinforce and prevent falling. Thanks to the hemispherical shape and large air outlet, it can reduce the resistance effectively with good ventilation and exhaust performance. The bottom part has dense filters and 45-degree inclined stainless steel louvers, which effectively keep dust or other debris away. Made of premium 201 stainless steel material, the air vent cover is anti-rust and has long service life. There are 9 specifications for you to choose from. The punching diameter is 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 160mm, 180mm, 200mm respectively. The ventilation cover is suitable for installing in the outside wall of home, restaurant, market, office building, etc. Item Name: Ventilation Cover Material: 201 Stainless Steel Color: Silver Applicable Place: Home/Restaurant/Market/Office Specifications: Punching Diameter: 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 160mm, 180mm, 200mm Features: Waterproof, Glossy Surface, Thickened Size Details: Punching Diameter: 50mm/1.97", 60mm/2.36", 80mm/3.15", 100mm/3.94", 120mm/4.72", 150mm/5.91", 160mm/6.3", 180mm/7.09", 200mm/7.87" (Approx.) Mounting Depth: 50mm, 60mm, 100mm: 40mm/1.57", 80mm: 35mm/1.38", 120mm, 150mm: 48mm/1.89", 160mm: 55mm/2.17", 180mm, 200mm: 60mm/2.36" (Approx.) 50mm, 60mm Size: 12.5cm x 12.5cm x 10.3cm/4.92" x 4.92" x 4.06" (Approx.) 70mm, 80mm Size: 12.5cm x 12.5cm x 10cm/4.92" x 4.92" x 3.94" (Approx.) 100mm Size: 14.5cm x 14.5cm x 11.3cm/5.71" x 5.71" x 4.45" (Approx.) 120mm Size: 14.5cm x 14.5cm x 12cm/5.71" x 5.71" x 4.72" (Approx.) 150mm Size: 18.5cm x 18.5cm x 14cm/7.28" x 7.28" x 5.51" (Approx.) 160mm Size: 19cm x 19cm x 15cm/7.48" x 7.48" x 5.91" (Approx.) 180mm Size: 22cm x 22cm x 17cm/8.66" x 8.66" x 6.69" (Approx.) 200mm Size: 22.5cm x 22.5cm x 17.3cm/8.86" x 8.86" x 6.81" (Approx.) Notes: The edge area of the stainless vent is sharp, please be careful. Please wear gloves when installing. Please keep out of reach of children. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Stainless Steel Ventilation Cover