Abstract: An evaporator, for use with a bottle containing a substance to be evaporated and a wick that has its lower portion disposed within the bottle and its upper portion protruding from the bottle, includes a housing in which the bottle is retained, a fan, disposed within the housing, for creating an airstream, and a louver structure, disposed downstream of the fan, for directing the airstream created by the fan upwardly and away from the upper portion of the wick. Preferably, the louver structure includes a plurality of louvers inclined at an angle between about 20 degrees to about 60 degrees relative to horizontal.

Abstract: A device for diffusing solutions having a porous element impregnated with a solution having active agents, and a heating element to heat the porous element promoting the evaporation of the active agents contained in the solution absorbed by the porous element. The porous element includes the heating element in the form of a resistive material deposited on an outer surface portion of the porous element. Electrical contacts adapted for connection to an electrical power source are also provided on the layer of resistive material.