Apparatus for emitting a chemical agent as a vapour comprises operative parts(2) and a decorative cover (4), the latter being shown in Fig. 2 removed forclarity and placed behind the operative parts. The decorative cover has curvedair inlet channels 6. The operative parts comprise a reservoir (24) containingthe chemical agent in liquid form； a wick (26) in communication with thechemical agent； an emanator (28) carried by the wick and located outside thereservoir and a fan (20), preferably battery-powered, to impel air over theemanator.
