Patent ID: 8770946

Claim:
A combination of an external accessory and a portable fan, the portable fan comprising a base having an air inlet located in an external side wall of the base, the air inlet comprising an array of apertures extending about the base, and a nozzle detachably connectable to the base, the nozzle comprising an annular inner casing section, an outer casing extending about the inner casing section, an interior passage located between the inner casing section and the outer casing section for receiving a primary air flow from the base, and a mouth for emitting the primary air flow, the inner casing section defining an opening extending through the nozzle and through which a secondary air flow from outside the fan is drawn by the primary air flow emitted from the mouth, the accessory comprising a high energy particle arrester filter and at least one connector for detachably connecting the accessory to the fan through rotation of the accessory relative to the base, the external accessory being in the form of a sleeve locatable about the external side wall of the base so that the filter is located upstream from the air inlet of the fan, wherein said at least one connector comprises a first connector for connecting the accessory to the base, and a second connector for connecting the accessory to the nozzle, wherein the nozzle comprises a connector for connecting the nozzle to the base, and wherein the first connector for connecting the accessory to the base is substantially the same as the connector for connecting the nozzle to the base.