Abstract: An apparatus for diffusing a vapor from a liquid into an air space. The apparatus includes an elongate outer tubular member having at least one outer vent opening defined thereon; an elongate inner tubular member received within the outer tubular member for a close rotatable fit therewith, the inner tubular member having at least one inner vent opening defined thereon that may brought into at least partial alignment with the at least one outer vent opening by rotation of the outer tubular member and the inner tubular member relative to each other; a connector portion adjacent one end of the inner tubular member and being operable to removably connect to a liquid container; an elongate cavity defined by the inner tubular member that is open to the connector portion and the container but closed at an opposite closed end; and an elongate wick received in the cavity and extending beyond the connector portion, the wick being operable to transmit by capillary action liquid form the container to the cavity.

Abstract: According to the invention there is provided a method of reducing microbial levels in the interior of a building, including vaporizing an anti-microbial essential oil to produce vaporized anti-microbial essential oil, entraining the vaporized anti-microbial essential oil in an air stream, and directing the air stream into the air ducts of the building and then into an interior air supply of the building.