Air treatment device

Claim 1

In combination, with an air duct having a duct wall, said wall having an opening therein, an air treatment device comprising: A substantially rectangular face plate fixedly secured to the duct wall, the face plate defining a port, and the port being aligned with the opening in the duct wall; hinge sleeves on one side of the face plate; an imperforate door configured to fit over the face plate, the door having hinge sleeves on one side thereof aligned with the hinge sleeves of the face plate; hinge pins extending through the aligned hinge sleeves, and hingedly connecting the door to the face plate, the door being movable from a pivoted open position providing access through the port and opening to a closed position over said port; a box secured to the face plate and projecting through the opening into the duct; the box having an imperforate back wall, imperforate side walls, and an open top frame; the box further having a lower base wall secured to the side and back walls; a pair of L-shaped flange members, one of said flange members being secured to each of the side walls, the flange members including horizontal foot portions which extend upwardly in closely spaced relation to the lower base wall; an upper base wall mounted for a limited sliding movement within the box between the lower base wall and the foot portions of the flanges; the upper base wall having a handle thereon to facilitate sliding movement thereof; the upper and lower base walls each having a series of holes formed therein, said holes being spaced apart and having imperforate sections therebetween, the holes of the respective walls being selectively alignable and movement of the upper base wall serving to fully close, fully or partially align the holes; and a quantity of air dispersible substance in an enclosure, said substance being conveyed through the duct when the holes are fully or partially aligned, said enclosure being supported on the upper base wall.