1、It adopts galvanized steel plate to prevent rust and corrosion and prevent secondary pollution. 2、Built-in egg-shaped silencer cotton, no need to worry about the increase of ventilation due to increased ventilation air volume and air volume, construction and installation is simple, is the ideal choice for air system customers. 3、The cutting edge is round and smooth, it will not scratch the pipe, and the installation is more worry-free. 4、It is easy to construct and install. It is widely used in air system and confined space air change system. It is an ideal choice for customers of air system. 5、The built-in egg-shaped silencer cotton effectively reduces the wind noise generated by the central air system and the central air-conditioning system due to the large air volume, and also provides you with a quiet and comfortable environment. Features: It adopts galvanized steel plate to prevent rust and corrosion and prevent secondary pollution. Built-in egg-shaped silencer cotton, no need to worry about the increase of ventilation due to increased ventilation air volume and air volume, construction and installation is simple, is the ideal choice for air system customers. The cutting edge is round and smooth, it will not scratch the pipe, and the installation is more worry-free. It is easy to construct and install. It is widely used in air system and confined space air change system. It is an ideal choice for customers of air system. The built-in egg-shaped silencer cotton effectively reduces the wind noise generated by the central air system and the central air-conditioning system due to the large air volume, and also provides you with a quiet and comfortable environment. Specifications: Material: Galvanized Sheet And Silencer Product Size: 41*32*24.2cm/16.14*12.6*9.53in Weight:2.073kg/73.12oz Package List: 1 * Ventilation Box 2 * Noise Cotton Several Accessories Note: Please allow 0-2cm/mm error due to manual measurement. Thanks for your understanding. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.