Suncourt RR100-B is a reliable fan that can be installed in the frame of any doorway. It operates quietly and allows the airflow direction to be customized upon installation. The device has a one-year limited warranty. Despite being designed for indoor use only, the fan can be conveniently installed in the top corners of a door frame on either the left or right side. It can be used to ventilate any room and comes with screws and cord clips for easy installation.