304 Stainless Steel Material: The round ventilation hood is made of high-quality stainless steel, which provides good corrosion resistance and can be used in various environments. It also has good hardness and strength, making it more durable than other materials. Insect Net: This 45° angled net prevents rainwater from entering. It also has an internal protective net to keep cockroaches and rodents away, contributing to a healthier living environment. Easy Installation: Before installation, angle out the side brackets of the ventilation hood to prevent it from falling out of the pipe opening. The brackets are easy to remove and clean (use gloves to protect your hands during installation). Application: Our wall vents are suitable for all bathroom and kitchen fan ventilation applications, and are also widely used in residential, office, and industrial environments, where they are ideal for indoor ventilation. Note: All measurements are taken manually; please allow an error of 1-3 cm due to differences in lighting and display. There may also be slight color variations; please refer to the actual product received.