Abstract: A portable fan includes an air generation assembly. The air generation assembly includes a motor assembly, a rear grill, a front grill connected to the rear grill, an internal space defined by the rear grill and the front grill, and an impeller located substantially within the internal space. The motor assembly includes a polymer housing including connecting features formed integral to the polymer housing and a shaft extending from the polymer housing. The impeller is connected to the shaft of the motor assembly and located substantially within the internal space. The rear grill has a central opening to interface with the connecting features of the polymer housing. Connection of the rear grill and the motor assembly is achieved absent the use of additional fasteners and/or additional components.

Abstract: Airflow from a blower fan can be adjusted between a cooling air mode where cooling air flows freely to the ambient surroundings and a noise mode where the airflow is partially or fully restricted in order to produce different levels of soothing background noise. The airflow from the fan can be split or divided between varying degrees and combinations of unrestricted airflow, partially restricted airflow and fully restricted airflow to produce a wide range of cooling airflows into the ambient with or without the production of additional background noise. A perforated drum surrounds the fan to form a chamber within which airflow can resonate at various frequencies and amplify noise levels selected by rotating the drum around the fan.