The Collaborative International Dictionary of English v.0.48:
Fumigator \Fu"mi*ga`tor\, n. One who, or that which, fumigates; an apparattus for fumigating. [1913 Webster]WordNet (r) 3.0 (2006):
fumigator n 1: someone whose job is to fumigate 2: a device that generates a gas for the purpose of disinfecting or eradicating pests