Patent ID: 7950988

Claim:
A diffuser for positioning in an opening of a passageway having conditioned air, the diffuser including: a grate assembly having an upper portion and a lower portion that depends downwardly from a lower surface of the upper portion, the upper portion having an aperture and a plurality of slotted sections; a pan assembly having a tray with an aperture formed therein and a plurality of upwardly depending legs, wherein each of the plurality of upwardly depending legs includes an upper portion that substantially abuts the lower surface of the upper portion of the grate assembly; and a retention assembly for coupling the grate assembly with the pan assembly and for installing the diffuser within the opening, the retention assembly comprising: a retention screw that is placed through the aperture in the upper portion of the grate assembly and the aperture in the tray of the pan assembly; and a member having a length greater than a diameter of the opening coupled to the retention screw in a location between the upper portion of the grate assembly and the tray, wherein the member resides in an unlocked position near the tray of the pan assembly when the diffuser is placed within the opening during installation, wherein turning the retention screw causes the member to rotate and contact at least one of the plurality of legs and assume a locked position, and wherein continued turning of the retention screw when the member is in the locked position causes the member to move upwardly along the retention screw toward the grate assembly.