Isifudumezi segesi se-air duct flue sisixhobo esisetyenziselwa ngokukodwa ukufudumeza kunye nokunyanga igesi ye-air duct flue. Ngokuqhelekileyo iqulethe izinto zokufudumeza, izixhobo zokulawula kunye neegobolondo, njl., kwaye inokusetyenziswa ngokubanzi kwiindawo ezahlukeneyo zemizi-mveliso, ii-incinerators, izityalo zamandla kunye nezinye iindawo apho i-flue gas idinga ukukhutshwa. Ngokufudumeza i-flue gas kubushushu obuthile, izinto ezinobungozi ezifana nokufuma, i-sulfides, kunye ne-nitrogen oxides kwi-flue gas inokususwa ngokufanelekileyo ukuhlambulula umoya kunye nokunciphisa ukungcola.