The rain louver is used to direct the exhaust air of package units and hoods to the exterior wall of buildings. Rain louvers are installed on the building façade and have various applications. For example, they can be used for kitchen hoods, or exhaust hoods in different environments. They can also be installed on the façade of buildings for general ventilation, as they are fully suitable for outdoor use. For this reason, they are also referred to as “fresh air louvers” or “fresh air vents.”