An improved scent pad and mechanism for housing the same. The mechanism ispreferably a part of a humidifier or similar device and positioned adjacent toa heated surface.The mechanism preferably includes a cover, a keyed portion and a rib portionwhich allowsthe scent pad to fit properly and prevents other shaped pads from beinginserted into orotherwise used in the housing mechanism, insuring optimal performance. In oneembodimentthe scent pad includes an upper straight edge, side edges, two lower bevelededges and alower straight edge situated between the beveled edges. The upper straightedge and lowerstraight edge are preferably substantially parallel to each other. The sideedges are preferablysubstantially parallel to each other and the beveled edges are preferablyarranged at an anglethat intersects both the lower straight edge and a side edge.
