# US 9,518,757 B2 · Air return grille assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,757 B2 - Document ID: US9518757B2 - Status: Granted - Kind: B2 - Application number: 13/718,215 - Filed: 2012-12-18 - Published: 2014-06-19 - Granted: 2016-12-13 - Earliest claimed: 2012-12-18 - Applicants: David James Boyce - Inventors: David James Boyce - Web page: https://patentgrep.com/patent/US9518757B2 ## CPC - F24F 13/082: {Grilles, registers or guards} - F24F 13/084: {with mounting arrangements, e.g. snap fasteners for mounting to the wall or duct} - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract Provided is air return grille assembly that is to be positioned over the open end of an air return duct. The air return grille assembly comprises a concealing arrangement joined to an air return grille such that it is spaced apart from the rear face of the air return grille. The concealing arrangement obstructs from view, through air flow openings in the air return grille, an air return duct when the air return grille is positioned over the open end of said duct. ## Claims ### Claim 1 An air return grille assembly for mounting over an open end of an air return duct, the air return grille assembly comprising: (a) a grille comprising an outer perimeter, a front face, a rear face, a plurality of openings passing through the front and rear faces for airflow through said grille, and an unperforated periphery portion residing adjacent the outer perimeter of the grille and spanning around an opening-equipped area in which the plurality of openings are located; (b) a concealing arrangement joined to the grille and residing in a fixed, stationary position spaced apart from the rear face and fully spanning the opening-equipped area of the grille; (c) a plurality of bosses through which the concealing arrangement is supported on the grille, said plurality of bosses extending between the concealing arrangement and the unperforated periphery portion of the grille at spaced apart positions around an outer perimeter of the concealing arrangement; and (d) a frame comprising a plurality of frame walls projectinq from the rear face of the grille at the outer perimeter thereof, the frame walls reaching and extending past the concealing arrangement at positions spaced outwardly from the outer perimeter thereof, with distal ends of the frame walls residing in a common plane for abutment of said distal ends of said frame walls against a wall surface around the open end of the air return duct, said plurality of fame walls being perpendicular to said common plane; (e) open airflow spaces situated between the plurality of bosses around the outer perimeter of the concealing arrangement and arranged to enable airflow around said concealing arrangement and onward through the air return duct; wherein the concealing arrangement obstructs from view, through the plurality of openings, the air return duct when the air return grille is positioned over the open end of said duct, while the plurality of bosses are hidden behind the unperforated periphery portion of the grille. ### Claim 2 (depends on 1) The air return grille assembly of claim 1, in combination with the return air duct and a wall of a building at which the open end of said return air duct opens into a room of said building and communicates air from said room into a heating and/or air conditioning system of said building, wherein the air return grille assembly resides in an installed position with the distal ends of the frame walls abutted against said wall of the building around the open end of the return air duct and the concealing arrangement residing over the open end of the air return duct. ### Claim 3 (depends on 1) The air return grille assembly of claim 1 wherein the plurality of openings in the grille are arranged in an ornamental pattern, and include openings of greater size than the bosses through which the concealment arrangement is supported. ### Claim 4 (depends on 1) The air return grille assembly of claim 1 wherein the distal end of each frame wall resides entirely within the common plane. ### Claim 5 (depends on 2) The air return grille assembly of claim 2 wherein the distal end of each frame wall of the grille assembly abuts the wall surface over a full length of said frame wall of the grille assembly. ### Claim 6 (depends on 1) The return air grille assembly of claim 1 wherein the outer perimeter of the grille is rectangular and the plurality of frame walls comprises two parallel frame walls residing at opposing sides of the rectangular outer perimeter of the grille. ### Claim 7 (depends on 6) The return air grille assembly of claim 6 wherein the plurality of frame walls comprises a third frame wall joining together said two parallel frame walls along a third side of the rectangular outer perimeter of the grille. ### Claim 8 (depends on 7) The return air grille assembly of claim 7 wherein a fourth side of the rectangular outer perimeter of the grille is unoccupied by a respective frame wall. ### Claim 9 (depends on 7) The return air grille assembly of claim 7 wherein the plurality of frame walls comprises a fourth frame wall joining together said two parallel frame walls along a fourth side of the rectangular outer perimeter of the grille.