US Patent 11359835 Variable louver control for fans

Systems for controlling louver positions are described herein. Such systems may include: a louver frame; a louver coupled to the louver frame via a rotation member and adapted to rotate at a louver side around an axis of rotation at the rotation member. In one embodiment, the louver includes a spring member engagement feature. The system also includes a spring member coupled to the louver frame and adapted to engage with the spring member engagement feature of the louver and apply a force to the louver when a forward airflow is applied to the louver in a forward airflow direction.