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I dont know Terry, but it is a funny contraption,you put oil of whatever...I think eucalyptus on it,plug it in to the outlet on the side of the cleaner,let it get hot,then there is a slot in the side that you turn to the blower,when you do air is forced thru the body and a cloud of vapor comes out,I mean a VISIBLE cloud...everyone who sees it howls with laughter!