Patent ID: 7070172

Claim:
A device for air freshening through a membrane with an adjustable degree of evaporation, wherein an air flow cooperates in the evaporation of a volatile substance, comprising: a container of at least one type of volatile substance; a strip of vapor permeable material in contact with said volatile substance, said strip being exposed to said air flow; a casing supporting said container and said strip of vapor permeable material to keep them under the influence of said air flow; and adjustment means for adjusting the degree of evaporation of said substance by means of a control of the air flow acting on said strip; wherein the adjustment means comprises an intermediate part and a rear part overlapped and with relative rotational capability between one another, said intermediate part and said rear part each comprising at least one window, such that with the relative rotation between both parts, the windows partially overlap to a greater or lesser extent, thus varying the area through which said air flow circulates.