A damper and a louver are two types of ventilation systems that are used to control airflow in a building. A damper is a device that is used to regulate the flow of air in a duct, vent, or chimney. It is typically made of metal and can be opened or closed to adjust the amount of air that passes through. A louver is a type of window or door that has adjustable slats or blades that can be opened or closed to control the amount of air that enters a room. Louvers are usually made of wood or metal and are often used to provide ventilation in bathrooms, kitchens, and other areas where air needs to be regulated. Both dampers and louvers are important components of a building’s ventilation system, as they help to regulate the temperature and humidity levels inside a building.