# US 2021/0239358 A1 · Base system for air handler > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0239358 A1 - Document ID: US20210239358A1 - Status: Published application - Kind: A1 - Application number: 17/162,795 - Filed: 2021-01-29 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: Air Distribution Technologies IP, LLC - Applicants: Air Distribution Technologies IP, LLC - Inventors: Scott A. Griesinger; Paul D. Studer - Web page: https://patentgrep.com/patent/US20210239358A1 ## CPC - F24F 13/32: Supports for air-conditioning, air-humidification or ventilation units - F24F 13/20: Casings or covers - F24F 2221/16: mounted on the roof - 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 A base system for a heating, ventilation, and air conditioning (HVAC) system includes a frame configured to support a housing of the HVAC system, where the frame includes a base rail configured to define a portion of a perimeter of the frame. The base rail includes a base segment configured to be disposed on a curb in an installed configuration of the HVAC system, an external wall extending from the base segment, a top segment extending from the external wall, an internal wall extending from the top segment, and a recessed flange extending from the internal wall and away from the external wall. ## Claims ### Claim 1 A base system for a heating, ventilation, and air conditioning (HVAC) system, comprising: a frame configured to support a housing of the HVAC system, wherein the frame comprises a base rail configured to define a portion of a perimeter of the frame, wherein the base rail comprises a base segment having a base rail face configured to abut a curb in an installed configuration of the HVAC system, an external wall extending transversely from the base segment, a top segment extending transversely from the external wall and over the base segment, an internal wall extending transversely from the top segment toward the base segment, and a recessed flange extending from the internal wall and away from the external wall. ### Claim 2 (depends on 1) The base system of claim 1, wherein the external wall comprises a first dimension extending from the base segment to the top segment, the internal wall comprises a second dimension extending from the top segment to the recessed flange, and the second dimension is less than the first dimension. ### Claim 3 (depends on 1) The base system of claim 1, comprising a floor panel coupled to and supported by the base rail, wherein the floor panel is secured to the recessed flange. ### Claim 4 (depends on 3) The base system of claim 3, wherein the floor panel is secured to the recessed flange via an adhesive. ### Claim 5 (depends on 3) The base system of claim 3, wherein the floor panel comprises a base portion and a lip extending from the base portion, wherein the base portion extends along and is secured to the recessed flange, and the lip extends along the internal wall. ### Claim 6 (depends on 5) The base system of claim 5, comprising a gasket disposed between the floor panel and the base rail. ### Claim 7 (depends on 6) The base system of claim 6, wherein the gasket extends continuously between the recessed flange and the base portion and between the lip and the internal wall. ### Claim 8 (depends on 3) The base system of claim 3, wherein the base rail is a first base rail, the frame comprises a second base rail configured to define an additional portion of the perimeter of the frame, the floor panel is coupled to and supported by the second base rail, and the second base rail is disposed on a side of the frame opposite the first base rail relative to the floor panel. ### Claim 9 (depends on 8) The base system of claim 8, comprising an interior cross rail extending between and coupled to the first base rail and the second base rail, wherein the floor panel is coupled to and supported by the interior cross rail. ### Claim 10 (depends on 1) The base system of claim 1, wherein the external wall comprises a punched hole configured to receive a lifting device. ### Claim 11 An enclosure for a heating, ventilation, and air conditioning (HVAC) system, comprising: a frame comprising a plurality of base rails defining a perimeter of the enclosure, wherein a base rail of the plurality of base rails comprises a base segment configured to be disposed on a curb in an installed configuration of the enclosure, an external wall extending from the base segment, a top segment extending from the external wall and toward an interior of the enclosure, an internal wall extending from the top segment toward the base segment, and a recessed flange extending from the internal wall toward the interior of the enclosure; and a floor panel captured between the plurality of base rails, wherein the floor panel is disposed on and secured to the recessed flange of the base rail. ### Claim 12 (depends on 11) The enclosure of claim 11, wherein the floor panel is coupled to and supported by the base rail and an additional base rail of the plurality of base rails, wherein the floor panel extends from the base rail to the additional base rail. ### Claim 13 (depends on 11) The enclosure of claim 11, wherein the floor panel comprises a base portion and a plurality of lips extending from the base portion, wherein the base portion is disposed vertically below the top segment of the base rail relative to a direction of gravity. ### Claim 14 (depends on 13) The enclosure of claim 13, wherein a lip of the plurality of lips extends along the internal wall of the base rail. ### Claim 15 (depends on 13) The enclosure of claim 13, comprising a gasket disposed between the base rail and the floor panel, wherein the gasket extends between the recessed flange and the base portion and extends between the internal wall and a lip of the plurality of lips. ### Claim 16 (depends on 15) The enclosure of claim 15, comprising a wall panel disposed on the top segment of the base rail, wherein the wall panel comprises a mounting flange secured to the external wall of the base rail, and wherein the gasket extends between the top segment and the wall panel. ### Claim 17 (depends on 11) The enclosure of claim 11, wherein the floor panel is secured to the recessed flange via an adhesive. ### Claim 18 (depends on 11) The enclosure of claim 11, wherein each additional base rail of the plurality of base rails comprises an additional base segment configured to be disposed on the curb in the installed configuration of the enclosure, an additional external wall extending from the additional base segment, an additional top segment extending from the additional external wall toward the interior of the enclosure, an additional internal wall extending from the additional top segment, and an additional recessed flange extending from the additional internal wall toward the interior of the enclosure. ### Claim 19 A heating, ventilation, and air conditioning (HVAC) system housing, comprising: a plurality of base rails coupled to one another to define a base frame of the HVAC system housing, wherein a base rail of the plurality of base rails comprises: a base segment configured to be disposed on a curb in an installed configuration of the HVAC system housing; an external wall extending vertically from the base segment; a top segment extending horizontally from the external wall and over the base segment; an internal wall extending vertically from the top segment toward the base segment, and a recessed flange extending horizontally from the internal wall and away from the external wall. ### Claim 20 (depends on 19) The HVAC system housing of claim 19, comprising: a plurality of wall panels coupled to the plurality of base rails to define an internal volume of the HVAC system housing; and a floor panel disposed entirely within the internal volume, wherein the floor panel comprises a base portion secured to the recessed flange of the base rail and a lip extending from the base portion and along the internal wall of the base rail.