A mechanical louver is a device that is used to control the amount of air or light that passes through an opening. It is typically made up of a series of slats or blades that are arranged in a way that allows for the desired amount of air or light to pass through. Louvers are commonly used in ventilation systems, such as those found in commercial buildings, to control the amount of air that enters a space. They can also be used in window coverings to control the amount of light that enters a room. Mechanical louvers are an effective way to control air flow and light in a space, as they can be adjusted to meet the specific needs of the environment.