A fan comprising a motor (806), an impeller (802) and a stator (804), defines an air flow passage between an air inlet and an air outlet. The fan has a mode of operation and an arrangement such that, in use, the trajectory of an air flow 801 through the air inlet is up to 360° in a direction which is generally perpendicular to the axis of rotation (805) of the impeller, the trajectory of the air flow through the air outlet is up to 360° in a direction which is generally perpendicular to the axis of rotation of the impeller, and the air flow through the air flow passage turns generally 180°. The fan has a mode of constant operation, and, in this mode, the operating point of the fan falls with the stall region of the fan characteristic. An air conditioning unit, a structure and method of installing the air conditioning unit are also claimed. Preferably the outlet is radial and forms a radial airflow pattern up to 90 degrees from the axis of rotation.
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