4600Z-881 115 V ac, AC Axial Fan, 119 x 119 x 38mm, 180m³/h, 18W. AC axial fans are used when DC voltage is not available and are designed to create airflow with a high flow rate and medium pressure. Axial fans have an impeller surrounded by blades which works in a similar way to a propeller. The motor of the fan is integrated into the hub of the impeller to provide a compact fan unit.