Low-noise axial fans are a common type of small axial fan ventilation and air exchange product, also a series within the larger category of axial fans. They are primarily used for ventilation and air exchange, or to enhance heat dissipation, in general factories, warehouses, offices, residential buildings, and similar environments. If the housing is removed, they can also function as free-standing fans and can be installed in series at intervals along longer exhaust ducts to increase the pressure within the pipes.