A fumigation apparatus for decontamination or disinfection of a building having a fumigation pollution source, a fog generator, a hose for conveying fog to a building to be fumigated and a nozzle on the outer end of said hose that includes a body portion and a radially extending flange that has at least one slot so that when said apparatus is pumping fog into said building air is drawn through the slots to improve the flow of fog into the building.
