Patent Publication Number: US-10765231-B2

Title: Discharge air straightener

Description:
TECHNICAL FIELD 
     The present disclosure relates to a temperature controlled case. More specifically, the present disclosure relates to a system for controlling an air-curtain of a temperature controlled case. 
     BACKGROUND 
     Temperature controlled cases are used for the storage, preservation, and presentation of products, such as food products including perishable meat, dairy, seafood, produce, etc. Temperature controlled cases may contain a number of shelves, each of which may be used to display products. Temperature controlled cases (e.g., refrigerated cases, freezers, merchandisers, etc.) may be used in both commercial and residential settings. For example and in regard to a commercial setting, grocer&#39;s stores or supermarkets typically have one or more aisles lined with temperature controlled cases or have one or more temperature controlled cases positioned in a desirable location. 
     To facilitate the preservation of the products, temperature controlled cases often include one or more cooling systems for maintaining a display area of the case at a desired temperature. The cooling systems may circulate refrigerated air to both remove heat from displayed products and to establish a protective air-curtain barrier between a temperature controlled zone and ambient conditions outside of the temperature controlled case. The air-curtain may be disposed behind a door of the temperature controlled case. Typical temperature controlled cases may have difficulty controlling the air-curtain along the length of the door, resulting in the introduction of ambient air into the air-curtain and/or the loss of refrigerated air from the air-curtain. As a result, typical temperature controlled cases may experience moisture buildup that negatively impacts the performance, efficiency, or desirability of the temperature controlled case. Accordingly, it is desirable to increase the effectiveness of the air-curtain in providing a barrier between the temperature controlled zone of the temperature controlled case and the ambient conditions outside of the temperature controlled case to prevent moisture buildup inside the temperature controlled case. 
     To facilitate the viewing of products, typical temperature controlled cases may include lighting elements (e.g., T8 fluorescents, light emitting diodes, etc.). Due to the depth and angle of the shelves in the temperature controlled case, these lighting elements may be placed beneath the shelves of the temperature controlled case, such that products on each shelf may be adequately illuminated. However, the lighting elements may undesirably produce heat within the temperature controlled case, near the products, which must be removed by the cooling system. As a result, the cooling system of the temperature controlled case may have to consume additional power due to the lighting elements. In some instances, the temperature controlled case may not be able to adequately compensate for the heat provided by the lighting elements. Accordingly, some products may be damaged due to over-cooling or undercooling of the products. Further, these lighting elements may be placed in close proximity to the shelves of the typical temperature controlled case, thereby reducing an illuminated region associated with the lighting elements. Accordingly, it is desirable to provide lighting elements that are not placed in confronting relation with products and which illuminate products on various shelves for a number of possible angles and orientations of the shelves of a temperature controlled case. 
     SUMMARY 
     One embodiment relates to a temperature controlled case. The temperature controlled case includes a number of shelves, an air-curtain, and a number of air-straighteners. The number of shelves individually support a displayed product. The number of shelves are mounted to the temperature controlled case. The air-curtain originates at an air-curtain discharge and terminates an air-curtain return. The number of air-straighteners is equal to the number of shelves. The number of air straighteners individually include a flow guide and are individually coupled to one of the number of shelves. The flow guides are located at locations within the air-curtain. The flow guides are configured to control the air-curtain. The flow guides individually include a luminaire comprising a number of LEDs coupled to a number of PCBs. The luminaires are configured to illuminate a number of illumination targets. The number of illumination targets correspond to at least one of the displayed products. 
     Another embodiment relates to a temperature controlled case. The temperature controlled case includes an air-curtain, a first shelf, a second shelf, and an air straightener. The air-curtain originates at an air-curtain discharge and terminates at an air-curtain return. The first shelf is defined by a first length. The second shelf is below the first shelf and is defined by a second length that is different than the first length. The air straightener includes a flow guide. The air straightener is coupled to the first shelf. The air straightener is disposed within the air-curtain at a location between, and separate from, the air-curtain discharge and the air-curtain return. The flow guide includes a luminaire. The luminaire includes a number of LEDs coupled to a number of PCBs. The luminaire has an illumination target where light produced by the number of LEDs is directed. The illumination target is located on the second shelf. 
     One embodiment relates to an air straightener for a temperature controlled case. The air straightener includes a flow guide and a number of support arms. The flow guide is disposed within an air-curtain. The flow guide includes a lower channel, an upper channel, a bottom retaining edge, a top retaining edge, a luminaire, and a lens. The upper channel is separate from the lower channel. The luminaire includes a number of LEDs coupled to a number of PCBs. The lens includes a lower leg, an upper leg, a lower edge, and an upper edge. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side cross-sectional view of a temperature controlled case, according to an exemplary embodiment of the present disclosure; 
         FIG. 2  is a side cross-sectional view of another temperature controlled case, according to an exemplary embodiment of the present disclosure; 
         FIG. 3  is a detailed view of shelves for a temperature controlled case, each having an air straightener, according to an exemplary embodiment of the present disclosure; 
         FIG. 4  is a detailed side view of a flow guide for a temperature controlled case, including a luminaire, according to an exemplary embodiment of the present disclosure; 
         FIG. 5  is a perspective view of the flow guide shown in  FIG. 4 ; 
         FIG. 6  is a side cross-sectional view of another temperature controlled case, according to an exemplary embodiment of the present disclosure; 
         FIG. 7  is a side cross-sectional view of another temperature controlled case, according to an exemplary embodiment of the present disclosure; 
         FIG. 8  is a top perspective view of a number of temperature controlled cases, including the temperature controlled case shown in  FIG. 7 , according to an exemplary embodiment of the present disclosure; 
         FIG. 9  is a detailed view of a product shown on a shelf of the temperature controlled case shown in  FIG. 8 ; 
         FIG. 10  is a side view of a shelf for a temperature controlled case in a first configuration, according to an exemplary embodiment of the present disclosure; 
         FIG. 11  is an enlarged view of a portion of the shelf shown in  FIG. 10 , according to an exemplary embodiment of the present disclosure; 
         FIG. 12  is a side view of the shelf shown in  FIG. 10  in a second configuration, according to an exemplary embodiment of the present disclosure; 
         FIG. 13  is a top perspective view of a portion of the shelf shown in  FIG. 10 , according to an exemplary embodiment of the present disclosure; 
         FIG. 14  is a side view of another shelf for a temperature controlled case in a first configuration, according to an exemplary embodiment of the present disclosure; 
         FIG. 15  is an enlarged view of a portion of the shelf shown in  FIG. 14 , according to an exemplary embodiment of the present disclosure; 
         FIG. 16  is side view of the shelf shown in  FIG. 14  in a second configuration, according to an exemplary embodiment of the present disclosure; 
         FIG. 17  is a top perspective view of a sliding track, according to an exemplary embodiment of the present disclosure; and 
         FIG. 18  is a top perspective view of a sliding insert, according to an exemplary embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, reference is made to the accompanying drawings, which form a part thereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. 
     Referring to the Figures generally, various embodiments disclosed herein relate to flow guides for a temperature controlled case. A number of the flow guides may be incorporated on air straighteners mounted within a temperature controlled case. The flow guides may interface with an air-curtain to control the direction of the air-curtain at various locations within the air-curtain. The flow guides may also be configured to illuminate products on various shelves. The flow guides may be mounted to various shelves within the temperature controlled case and/or mounted directly to the temperature controlled case. In some embodiments, the flow guides are incorporated into the shelves. The flow guides may produce an effect configured to control the air-curtain along a travel defined from an air-curtain discharge to an air-curtain return. According to one embodiment, the flow guides are angularly displaced relative to a primary direction of the air-curtain. 
     The flow guides may contain luminaires. The luminaires may contain printed circuit boards (PCBs) having surface-mount devices (SMDs) and light emitting diode (LEDs). The luminaires may have a number of illumination targets where light from the LEDs is focused. The illumination targets may correspond to displayed products on the various shelves in the temperature controlled case. The luminaires may be configured to illuminate shelves below the luminaires. The air straighteners may include a gravity orientation mechanism configured to facilitate a desired orientation of the flow guides. The air straighteners or shelves may include a cam-track mechanism configured to allow the air straighteners or the shelves, respectively, to be reconfigured. The gravity orientation mechanism and the cam-track mechanism may be utilized to maintain illumination of products on various shelves after the shelves have been reconfigured. 
     Advantageously, the flow guides may control the air-curtain such that air from the air-curtain is substantially maintained within the air-curtain, air from outside of the temperature controlled case is substantially prohibited from entering the air-curtain, and air from within the temperature controlled case is substantially prohibited from leaving the temperature controlled case. Rather than mixing air from the air-curtain and outside of the temperature controlled case, thereby resulting in moisture buildup that may require larger fans and result in greater inefficiency, the temperature controlled case of the present disclosure may provide an effective barrier between the air-curtain and the air outside of the temperature controlled case. Accordingly, the temperature controlled case of the present disclosure may operate in a relatively more efficient manner and consume less energy than a typical temperature controlled case. 
     The flow guides may illuminate products on shelves of varying lengths. For example, a first shelf having a flow guide and being defined by a length may illuminate a second shelf having a length less than the length of the first shelf. In various embodiments, the air-curtain cools the luminaires thereby reducing temperature increase of the temperature controlled case due to illumination compared to a typical temperature controlled display case. The air straighteners, flow guides, luminaires, and various components thereof are configured to be interchangeable and upgradable such that the temperature controlled case may be tailored for a target application. These and other features of the present disclosure are described more fully herein. 
     Referring now to  FIG. 1 , a first display case, shown as temperature controlled case  100  for displaying products (e.g., produce, dairy products, beverages, meat products, etc.), shown as products  105 , includes a first number of shelves, shown as shelves  110 , a first air discharge (e.g., origin, etc.), shown as air-curtain discharge  120 , and a first air return, shown as air-curtain return  130 . Products  105  may be representative of a number of different products which may be placed on shelves  110 . Individually, shelves  110  may include a first number of air straighteners, shown as air straighteners  140 . Display cases, such as temperature controlled case  100 , may be utilized to display products, such as food products including perishable meat, dairy, seafood, and produce. Temperature controlled case  100  may be mounted on a mounting surface (e.g., floor, ground, etc.) and have an exterior proximate an ambient environment (e.g., outside environment, store environment, etc.) having ambient conditions (e.g., outside conditions, store conditions, etc.) and an interior having a temperature controlled zone. According to various embodiments, shelves  110  are configured to support products for display within temperature controlled case  100  and to be mounted to temperature controlled case  100 . For example, fresh dairy products (e.g., milk, cheese, eggs, etc.) may be displayed on shelves  110 . In some applications, it may be desirable for shelves  110  to be mounted such that shelves  110  are substantially parallel to the mounting surface. In other applications, it may be desirable for shelves  110  to be mounted such that shelves  110  are at an angle relative to the mounting surface. For example, shelves  110  may be mounted such that shelves  110  are at an angle towards the mounting surface (e.g., mounted at a downward angle). Shelves  110  may be spaced a target distance apart in both vertical and horizontal directions to allow for various products to be displayed. Temperature controlled case  100  may include more or less shelves  110  depending on the target distances between each of shelves  110  such that temperature controlled case  100  may be tailored for a target application. In other embodiments, air straighteners  140  are mounted to temperature controlled case  100 . 
     A typical temperature controlled case may utilize lighting elements (e.g., T8 fluorescents) to provide lighting inside the typical temperature controlled case. These lighting elements are usually mounted directly to the underside of a shelf, underneath displayed product. The lighting elements may be mounted directly under the shelves in order to minimize visual impact of the lighting elements on a customer and to maximize the refrigerated volume of the temperature controlled case. However, the arrangement of the lighting elements in the typical temperature controlled case may result in heat generation problems, and thereby cooling problems for the temperature controlled case. Further, the lighting elements may result in localized heat generation problems because they are mounted such that they are in confronting relation with a shelf of the typical temperature controlled case. In other applications, the lighting elements are mounted near a top cornice of the typical temperature controlled case. In these applications, light from the lighting element may not adequately illuminate lower shelves. 
     Accordingly, in many applications it may be desirable to adequately illuminate all products in a temperature controlled case without introducing a substantial amount of heat into the temperature controlled case. Air straighteners  140  may include a luminaire configured to illuminate products  105  on shelves  110 . The top shelf  110  in temperature controlled case  100  may be lit by the luminaire, ambient light, or an auxiliary light positioned proximate the top cornice of temperature controlled case  100 . The luminaire may facilitate illumination of products  105  along the entire length of various shelves  110 . Conversely, the lighting elements of the typical temperature controlled case may contain dead spots where illumination is not adequately present, such as a front portion of the shelves. For example, in a typical temperature controlled case including a first shelf having a first length and a second shelf having a second length greater than the first length, products displayed on a front portion of the second shelf may not be adequately illuminated by a lighting element mounted under the first shelf. As a result, typical temperature controlled cases may utilize shelves that are of similar length resulting in a temperature controlled case that is less desirable. Accordingly, in the typical temperature controlled case, the front faces of products containing important information (e.g., product name, price, etc.) may not be easily visible to a customer. This results in decreased capacity and/or undesirable operation of the typical temperature controlled case. Luminaires, such as that included in air straighteners  140 , may facilitate uniform placement of products  105  on shelves  110 . Further, the luminaires may facilitate increased storage capacity of shelves  110  compared to the shelves of a typical temperature controlled case. 
     According to various embodiments, shelves  110  of temperature controlled case  100  are of different lengths (e.g., fifty centimeters, fifty-six centimeters, sixty-one centimeters, etc.). The length of a shelf (e.g., shelf  110 ) may be defined as a distance from a back wall of the temperature controlled case (e.g., temperature controlled case  100 ) to a front edge of the shelf in confronting relation with an air-curtain (e.g., air-curtain  170 ). In one example, temperature controlled case  100  may have a first shelf  110  having a length of approximately fifty centimeters (e.g., twenty inches), a second shelf  110  having a length of approximately fifty-six centimeters (e.g., twenty-two inches), and a third shelf  110  having a length of approximately fifty centimeters. In other embodiments, shelves  110  of temperature controlled case  100  are all the same length. The luminaires may advantageously facilitate adequate lighting of products  105  on each of shelves  110  such that a front face of products  105  may readily be visible by a customer. 
     Temperature controlled case  100  may be a refrigerator, a freezer, a refrigerated merchandiser, a refrigerated display case, or other device capable of use in a commercial, institutional, or residential setting for storing and/or displaying refrigerated and/or frozen objects. For example, temperature controlled case  100  may be a service type refrigerated display case for displaying fresh food products (e.g., meat, dairy, produce, etc.) in a supermarket or other commercial setting. Temperature controlled case  100  may be configured to provide a refrigerated zone and/or a heated zone within temperature controlled case  100 . Temperature controlled case  100  may have a number of doors (e.g., closed door case) or sliding panels. In other examples, temperature controlled case  100  may not have a door (e.g., open-case). The number of doors may allow selective access to within temperature controlled case  100 . For example, access to within temperature controlled case  100  may be provided when a door is in an open position, and access to within temperature controlled case  100  may be prohibited when the door is in a closed position. 
     Shelves  110  may be mounted (e.g., secured, affixed, attached, etc.) to temperature controlled case  100  in a permanent manner (e.g., welded, riveted, integrated, etc.) or a removable manner (e.g., fastened, interlocked, interconnected, etc.). For example, shelves  110  may be fastened to temperature controlled case  100  through the use of fasteners (e.g., screws, bolts, etc.). In another example, shelves  110  may include prongs (e.g., protrusions, protuberances, studs, etc.) configured to interact with slots (e.g., channels, tracks, etc.) in temperature controlled case  100  such that shelves  110  may be interlocked to temperature controlled case  100 . Shelves  110  may be of a solid, semi-solid, or mesh construction. For example, shelves  110  may be of a wire rack construction. Shelves  110  may be baskets such as wire baskets. Shelves  110  may include hooks or pegs for hanging various display products such as meats and cheese. Shelves  110  may be constructed of various materials such as aluminum, stainless steel, glass, tempered glass, frosted glass, wire, plastic, and other materials such that temperature controlled case  100  may be tailored for a target application. Shelves  110  may be coated and/or painted. For example, shelves  110  may be coated such that shelves  110  are resistant to frost buildup or other moisture buildup and/or painted to match a specific hex color code. Shelves  110  may be coated with a non-stick coating, a non-slip coating, an anti-microbial coating or other coating such that temperature controlled case  100  may be tailored for a target application. 
     Individually, air straighteners  140  may include a first beam, shown as support arm  150 , and a first guide, shown as flow guide  160 . In some embodiments, air straighteners  140  individually include flow guide  160 . In other embodiments, air straighteners  140  individually include a number of flow guides  160 . Air straighteners  140  may be mounted (e.g., secured, affixed, fastened, welded, attached, etc.) to shelves  110  in a permanent manner (e.g., welded, riveted, integrated, etc.) or a removable manner (e.g., fastened, interlocked, interconnected, etc.). For example, air straighteners  140  may be fastened to shelves  110  through the use of fasteners (e.g., screws, bolts, etc.). In another example, air straighteners  140  may include prongs (e.g., protrusions, protuberances, studs, etc.) configured to interact with slots (e.g., channels, tracks, holes, etc.) in shelves  110  such that air straighteners  140  may be interlocked to shelves  110 . According to various embodiments, support arms  150  are configured to structurally couple air straighteners  140  to shelves  110 . In other embodiments, support arms  150  are configured to structurally couple air straighteners  140  to temperature controlled case  100 . 
     In various embodiments, temperature controlled case  100  includes a cooling system including a number of fans configured to discharge air from air-curtain discharge  120  and to receive air in air-curtain return  130 . In operation, a first air flow, shown as air-curtain  170 , flows between air-curtain discharge  120  and air-curtain return  130 , and is defined by a travel between air-curtain discharge  120  and air-curtain return  130 . According to various embodiments, air-curtain  170  originates at air-curtain discharge  120  and terminates at air-curtain return  130 . As shown in the Figures, air-curtain  170  may be concentrated in a general area between air-curtain discharge  120  and air-curtain return  130 . However, air-curtain  170  may not be entirely contained in the concentrated area. Accordingly, the depiction of air-curtain  170  is representative only of the concentrated area and not intended to depict a total confinement of air-curtain  170 . 
     Similarly, while air-curtain  170  is depicted and generally described as flowing from air-curtain discharge  120  to air-curtain return  130 , it is understood that other configurations are also possible. For example, air-curtain  170  may flow from air-curtain return  130  to air-curtain discharge  120 . In some applications, temperature controlled case  100  may include a second air-curtain discharge in place of air-curtain return  130 . In some embodiments, air-curtain discharge  120  is configured to discharge a second air-curtain in addition to air-curtain  170 . For example, the second air-curtain may include air from air-curtain  170  that has exited air-curtain  170  as well as ambient air. In these embodiments, air straighteners  140  and/or flow guides  160  can be used to control the second air-curtain and/or air-curtain  170 . In other embodiments, air-curtain return  130  is configured to discharge a second air-curtain in addition to air-curtain  170 . For example, the second air-curtain may include air from air-curtain  170  that has exited air-curtain  170  as well as ambient air. In these embodiments, air straighteners  140  and/or flow guides  160  can be used to control the second air-curtain and/or air-curtain  170 . Air-curtain  170  may have a temperature that is the same or different than the ambient environment. In application, displayed product may be placed on shelves  110 . Shelves  110  may not facilitate placement of displayed product within air-curtain  170 . Rather, in one embodiment, shelves  110  prohibit the placement of displayed product within air-curtain  170 . 
     Air-curtain  170  may provide a protective barrier between a temperature controlled zone within temperature controlled case  100  and the ambient conditions outside of temperature controlled case  100 . For example, the ambient conditions outside of temperature controlled case  100  may be of an undesired temperature and/or humidity (e.g., moisture content). In this case, air-curtain  170  may facilitate the preservation of the temperature controlled zone, having a different temperature and/or humidity than the ambient conditions outside of temperature controlled case  100 . In some embodiments, support arms  150  include a number of air channels that are configured to facilitate the passage of air-curtain  170  through air straighteners  140 . 
     A typical temperature controlled case may have an air-curtain having a travel between an outlet and an inlet and facilitating a partial barrier between controlled air (e.g., refrigerated air) and ambient air (e.g., outside air). The air-curtain of the typical temperature controlled case may become disorganized (e.g., chaotic, turbulent, etc.) along the travel due to turbulence, length of travel, and other factors. Accordingly, the air-curtain of the typical temperature controlled case may be subject to the introduction of ambient air into the air-curtain and the loss of controlled air from the temperature controlled case. The moisture content of the ambient air may be higher than that of the controlled air. As a result, the typical temperature controlled case may be subject to an increased refrigerant load and operate in an undesirable manner (e.g., inefficiently, ineffectively, etc.) due to the introduction of the ambient air. The introduction of the ambient air may additionally deposit moisture (e.g., water, ice, frost, etc.) on various locations and components of the typical temperature controlled case and result in an undesirable user experience with the typical temperature controlled case. For instance, a glass window of a door to the typical temperature controlled case may undesirably become obscured due to frost or fog prohibiting proper viewing of the contents within the typical temperature controlled case by the user. Similarly, water, frost, and/or ice may buildup on displayed products within the typical temperature controlled case. To account for these issues, many typical temperature controlled cases include larger fans which may be more energy consuming, expensive, and may produce more noise than the fans of temperature controlled case  100 . 
     Advantageously, temperature controlled case  100  utilizes flow guides  160  to control air-curtain  170  from air-curtain discharge  120  to air-curtain return  130 . Flow guides  160  may control air-curtain  170  by producing an effect, such as displacement, rotation, pressurization, depressurization, or other suitable effect on the air within air-curtain  170 . As a result, air-curtain  170  is more effective at providing a barrier between the refrigerated zone of temperature controlled case  100  and the ambient environment, facilitating a lower refrigeration load and more desirable user experience compared to the typical temperature controlled case. Additionally, temperature controlled case  100  may be more efficient and/or effective than the typical temperature controlled case. 
     According to various embodiments, flow guides  160  are configured to control (e.g., direct, maintain, translate, rotate, pressurize, depressurize, etc.) air-curtain  170  at various points along the travel of air-curtain  170 . For example, flow guides  160  may be placed on one or more shelves  110 . In one example, temperature controlled case  100  may include four shelves  110  each individually having air straightener  140  and correspondingly flow guide  160 . According to various embodiments, flow guides  160  are located at locations within air-curtain  170  and are configured to control air-curtain  170  at the locations within air-curtain  170 . Flow guides  160  may be configured to maintain and insure the concentrated area of air-curtain  170  at various points along the travel of air-curtain  170 . 
     Flow guides  160  may have various shapes and be of various sizes. For example, flow guides  160  may have a concave, a convex, or an air foil shape. Flow guides  160  may have one side that is flat, may be semi-symmetrical, or may be symmetrical. In other examples, flow guides  160  may have a straight or curved shape. Flow guides  160  may individually have an outside surface proximate the exterior of temperature controlled case  100  and an inside surface proximate the interior of temperature controlled case  100 . In various embodiments, all of the surfaces of flow guides  160  are configured to have a low surface roughness. In some embodiments, the outside surfaces of flow guides  160  have different surface characteristics than the inside surfaces of flow guides  160 . For example, the inside surfaces of flow guides  160  may have a lower surface roughness than the outside surfaces of flow guides  160 . 
     In some applications, it may be desirable to utilize air straighteners  140  to provide additional capabilities to temperature controlled case  100 . For example, air straighteners  140 , support arms  150 , and/or flow guides  160  may incorporate price tags, tickets, labels, markings, barcodes, stickers, or other product information such that temperature controlled case  100  may be tailored for a target application. The additional product information may be permanently or temporarily incorporated within air straighteners  140 . In one embodiment, the outside surfaces of flow guides  160  include product information (e.g., price, barcode, descriptive information, etc.). In another embodiment, product information is suspended (e.g., attached, hung, etc.) from support arms  150 . In one embodiment, product information is suspended (e.g., attached, hung, etc.) from air straighteners  140 . Air straighteners  140 , Support arms  150 , and/or flow guides  160  may include retaining features configured to selectively secure product information. In some embodiments, the product information may be physically captured by air straighteners  140 . In other embodiments, air straighteners  140  utilize a magnetic interface to retain the product information. In still other embodiments, air straighteners  140  include liquid crystal displays (LCDs). For example, air straighteners  140  may include LCDs on support arms  150  and/or flow guides  160 . The retaining features may be protrusions, protuberances, clips, prongs, hooks, magnetic coupling points, vacuum coupling points (e.g., suction cups, etc.), Velcro®, hook and loop fasteners, or other suitable retaining features such that temperature controlled case  100  may be tailored for a target application. In some embodiments, support arms  150  are selectively repositionable (e.g., extendable, retractable, etc.) between a number of positions. For example, support arms  150  may be telescopic and/or adjustable such that flow guides  160  may be positioned at a number of locations. 
     Each air straightener  140 , support arm  150 , and/or flow guide  160  may individually be configured to incorporate information for a displayed product proximate air straightener  140 , support arm  150 , and/or flow guide  160 . For example, shelf  110  may include two flow guides  160 , the first flow guide  160  proximate a first displayed product and the second flow guide  160  proximate a second displayed product. According to this example, the first flow guide  160  may be configured to provide product information (e.g., a price tag, etc.) about the first displayed product and the second flow guide  160  may be configured to provide product information (e.g., a price tag, etc.) about the second displayed product. In some applications, air straighteners  140 , support arms  150 , and/or flow guides  160  may provide tactile information about a displayed product such as a product sample or Braille text. 
     In other applications, air straighteners  140 , support arms  150 , and/or flow guides  160  may be configured to be or to include visual display screens configured to provide visual product information. Air straighteners  140  may also provide additional lighting capabilities for temperature controlled case  100 . The additional lighting capabilities may be permanently or temporarily incorporated within air straighteners  140 . For example, air straighteners  140 , support arms  150 , and/or flow guides  160  may incorporate LEDs configured to illuminate the interior of temperature controlled case  100 . The LEDs may be high-powered light-emitted diodes, LED arrays, organic light-emitted diodes (OLEDs), or other suitable light emitting devices, either alone or along with associated circuitry. The LEDs may be configured to illuminate a region above and/or below shelf  110 . For example, the LEDs may provide illumination to displayed products on shelves  110 . 
     In some applications, it may be desirable for air straighteners  140  to provide additional sensing capabilities to temperature controlled case  100 . In these applications, support arms  150  and/or flow guides  160  may include various sensors configured to transmit information (e.g., data, readings, etc.) to temperature controlled case  100 . For example, flow guides  160  may incorporate an air flow speed (e.g., mass air flow speed, MAF, etc.) sensor configured to monitor the speed of air-curtain  170 . In another example, flow guides  160  may incorporate a temperature sensor configured to monitor the temperature of air-curtain  170 . The additional sensing capabilities provided by air straighteners  140  may be utilized by temperature controlled case  100  to determine sensing data such as usage patterns, overall usage, energy loss and other pertinent sensing data such that temperature controlled case  100  may be tailored for a target application. In some applications, temperature controlled case  100  may utilize the sensing data to adjust air flow speed of air-curtain  170  and/or temperature of the interior of temperature controlled case  100 . In other applications, temperature controlled case  100  may utilize the sensing data to determine maintenance needs or maintenance schedules for temperature controlled case  100 . 
     Shelf  110  may include a continuous air straighter  140  or multiple air straighteners  140  spaced apart along the length of shelf  110 . Accordingly, air straighteners  140  may be elongate. In one example, air straightener  140  is a continuous, thin strip along at least a portion of the length of shelves  110 . Air straighter  140  may include a number of air channels configured to facilitate the transfer of air-curtain  170  through air straighter  140 . The air channels may be rectangular, square, circular, triangular, hexagonal, and polygonal, a combination thereof, or any other suitable shape or combination of shapes such that air straightener  140  is tailored for a target application. In some applications, it may be desirable for the visual impact of air straighteners  140  to be a small as possible. Accordingly, air straighteners  140  may be a wire rod or may be constructed from at least partially clear (e.g., transparent, partially-transparent, translucent, etc.) plastic or other material. 
     In some applications, different shelves  110  may have different combinations of air straighteners  140  or flow guides  160 . For example, a first shelf  110  may have a continuous air straightener  140  while a second shelf  110  may have more than one air straightener  140 . In some applications, it may be desirable for air straightener  140  to incorporate more than one flow guide  160 . Air straightener  140  may include two, three, four, or any number of flow guides  160 . For example, air straightener  140  may include two flow guides  160 . The flow guides  160  may cooperate to control air-curtain  170 . 
     Flow guides  160  may be configured to be at an angle relative to a primary direction of air-curtain  170 . The primary direction of air-curtain  170  may be a centerline of air-curtain  170 . According to various embodiments, the primary direction of air-curtain  170  is substantially perpendicular to the mounting surface for temperature controlled case  100 . The angle may be defined by the angular distance between the primary direction of air-curtain  170  and the portion of flow guide  160  proximate air-curtain return  130  where clockwise rotation is termed positive. In various embodiments, flow guides  160  are positioned substantially parallel (e.g., an angle of zero degrees) to the primary direction of air-curtain  170 . In other embodiments, flow guides  160  are positioned at a positive angle relative to the primary direction of air-curtain  170 . In one embodiment, flow guides  160  are positioned at a fifteen degree angle relative to the primary direction of air-curtain  170 . In other embodiments, flow guides  160  are positioned at a negative angle relative to the primary direction of air-curtain  170 . In one embodiment, flow guides  160  are positioned at a negative fifteen degree angle relative to the primary direction of air-curtain  170 . 
     In some applications, it may be desirable to selectively reposition the angle of flow guides  160  relative to the primary direction of air-curtain  170 . For example, flow guides  160  may be selectively repositionable between fifteen degrees relative to the primary direction of air-curtain  170  and negative fifteen degrees relative to the primary direction of air-curtain  170 . In some embodiments, flow guides  160  are selectively repositionable between a number of angular positions. The angular positions that flow guides  160  are selectively repositionable in may include a position that is substantially parallel to a primary direction of the air-curtain. According to various embodiments, support arms  150  are substantially parallel to shelves  110 . During the useful life of temperature controlled case  100 , shelves  110  may be repositioned. Accordingly, in some embodiments, flow guides  160  are selectively repositionable to a number of locations that substantially correspond with a number of orientations of shelves  110 . In one embodiment, air straightener  140  includes a plurality of detents configured to define positions of support arms  150  and/or flow guides  160 . 
     According to a target application, support arms  150 , flow guides  160 , and shelves  110  may be constructed from various materials such as aluminum, stainless steel, glass, tempered glass, frosted glass, wire, plastic, and other materials such that temperature controlled case  100  is tailored for a target application. In various embodiments, support arms  150 , flow guides  160 , and shelves  110  are constructed from aluminum. According to various examples, support arms  150 , flow guides  160 , and shelves  110  may be made of the same or different materials. For example, shelves  110  and support arms  150  may be made of a metallic construction such as steel or aluminum while flow guides  160  may be made of a polymeric (e.g., plastic, etc.) construction. In some applications, it may be desirable to interchange flow guides  160 . For example, in applications where flow guides  160  incorporate product information, different flow guides  160  may necessary if flow guides  160  are reconfigured. Similarly, in applications where flow guides  160  incorporate additional lighting capabilities, it may be desirable to remove, replace, and/or upgrade the additional lighting capabilities and in applications where flow guides  160  incorporate additional sensing capabilities, it may be desirable to remove, replace, and/or upgrade the additional sensing capabilities. 
     Temperature controlled case  100  may have a useful life. The useful life of temperature controlled case  100  may be defined as the period of time during which temperature controlled case  100  may be operational. In many applications, it may be desirable to have the ability to reconfigure temperature controlled case  100  at various points throughout the useful life of temperature controlled case  100 . For example, a user of temperature controlled case  100  may initially configure temperature controlled case  100  to display dairy products, however, after observing higher demand for meat products, the user may wish to utilize temperature controlled case  100  to display meat products. According to various embodiments, shelves  110  and air straighteners  140  are reconfigurable by the user such that temperature controlled case  100  may be tailored for various applications. Similarly, different shelves  110 , air straighteners  140 , support arms  150 , and/or flow guides  160  may be incorporated within temperature controlled case  100  in place of or in addition to shelves  110  and/or air straighteners  140  previously incorporated within temperature controlled case  100 . For example, the user may wish to provide additional capabilities to temperature controlled case  100  by incorporating a basket style shelf  110  into temperature controlled case  100 . In this example, the user may replace or supplement previously incorporated shelves  110 . 
     In one embodiment, air straighteners  140  are selectively repositionable between a number of angles relative to the primary direction of travel of air-curtain  170 . According to this embodiment, air straighteners  140  are repositionable when temperature controlled case  100  is reconfigured to provide necessary control of air-curtain  170 . In one example, temperature controlled case  100  may have shelves  110  that are reconfigured from one angle relative to the mounting surface to another angle relative to the mounting surface. In order to account for this change, air straighteners  140  may be repositioned. 
     According to various embodiments, air straighteners  140  include gravity orientation mechanisms configured to orientate flow guides  160  such that flow guides  160  are perpendicular with a direction of gravity. In some embodiments, the gravity orientation mechanisms are mounted directly to flow guides  160 . The gravity orientation mechanisms may utilize off-center axis of rotation (relative to air straighteners  140 ) such that flow guides  160  adjust due to the pull of gravity, with limiting features to set extents of rotation (e.g., fifteen degrees, etc.). The gravity orientation mechanism may be a weighted lever, cantilever beam, cam design, gyroscopic mechanism, or other mechanism configured to provide a constant orientation to an object. The direction of gravity may be substantially perpendicular to the mounting surface. The direction of gravity may be structurally limited by air straighteners  140  such that flow guides  160  may not be repositioned beyond a target location. In one application, temperature controlled case  100  may have shelves  110  that are reconfigured from an angle parallel with the mounting surface to a downward angle relative to the mounting surface, such as that used for meats. According to this application, air straighteners  140  including gravity orientation mechanisms may automatically orientate flow guides  160  such that flow guides  160  are parallel to the primary direction of air-curtain  170 . According to various embodiments, the gravity orientation mechanism is configured to facilitate a constant orientation of flow guides  160  within air-curtain  170 . 
     In some applications, it may be desirable for air straighteners  140  to be retrofit on typical temperature controlled cases. In this manner, the typical temperature controlled cases may be upgraded to an air-curtain similar to air-curtain  170 . In some embodiments, air straighteners  140  and/or flow guides  160  can be releasably retained (e.g., snap fit, snapped on, clipped on, etc.) to shelves  110 . Depending on the configuration of the typical temperature controlled case, various shelves of the typical temperature controlled case may be oriented at different angles relative to a primary mounting surface of the temperature controlled case. In these retrofit applications, air straighteners  140  may include a cam-track mechanism that is selectively repositionable between a number of fixed positions corresponding to a number of possible angular orientations of shelves  110 . 
     In alternative examples, shelves  110  may include the cam-track mechanism rather than air straighteners  140 . According to various embodiments, the cam-track mechanism is coupled to air straightener  140 . In other embodiments, the cam-track mechanism is coupled to flow guides  160 . In still other embodiments, the cam-track mechanism is coupled to shelves  110 . The cam-track mechanism may facilitate a constant placement of flow guides  160  in the air-curtain of the typical temperature controlled case. For example, a shelf in the typical temperature controlled case may be oriented fifteen degrees from a horizontal plane parallel to the mounting surface. According to this example, the cam-track mechanism may allow air straighteners  140  to be selectively positioned to match the fifteen degree angular orientation of the shelf. Similarly, in some applications temperature controlled case  100  may have air straighteners  140  that include cam-track mechanisms. In these applications, shelves  110  may be repositioned similarly to the shelves of the typical temperature controlled case. According to various embodiments, the cam-track mechanism is configured to facilitate the selective repositioning of flow guide  160  within air-curtain  170 . 
     As shown in  FIG. 2 , a second display case, shown as temperature controlled case  200  includes a second number of shelves, shown as shelves  210 , a second air discharge, shown as air-curtain discharge  220 , and a second air return, shown as air-curtain return  230 . Individually, shelves  210  may include a second number of air straighteners, shown as air straighteners  240 . Individually, air straighteners  240  may include a second beam, shown as support arm  250 , and a second guide, shown as flow guide  260 . Similar to air straighteners  140 , air straighteners  240  may include a luminaire. In some embodiments, a luminaire is integrated into flow guide  260 . In operation, a second air flow, shown as air-curtain  270 , flows between air-curtain discharge  220  and air-curtain return  230 , and is defined by a travel between air-curtain discharge  220  and air-curtain return  230 . The primary direction of air-curtain  270  may be a centerline of air-curtain  270 . It is understood that the foregoing description of temperature controlled case  100 , shelves  110 , air-curtain discharge  120 , air-curtain return  130 , air straighteners  140 , support arms  150 , flow guides  160 , and air-curtain  170  similarly applies to and describes temperature controlled case  200 , shelves  210 , air-curtain discharge  220 , air-curtain return  230 , air straighteners  240 , support arms  250 , flow guides  260 , and air-curtain  270 , where similar symbols correspond to similar components. 
     Like air-curtain  170 , air-curtain  270  may be partially defined by a concentrated area along a travel of air-curtain  270 . Unlike air-curtain  170 , the concentrated area of air-curtain  270  may fluctuate along the travel of air-curtain  270 . Accordingly, it may be desirable to locate flow guides  260  at various locations within air-curtain  270 , where the locations are defined relative to a primary direction of air-curtain  270  centered about the concentrated area of air-curtain  270 . In application, the length of support arm  250  may be varied such that the location of flow guide  260  may be varied. For example, temperature controlled case  200  may include two shelves  210  each having air straighteners  240 . In this example, air straighteners  240  of the first shelf  210  may have a longer support arm  250  than air straighteners  240  of the second shelf  210 . In this manner, a larger span of air-curtain  270  may be controlled by flow guides  260  than if all support arms  250  had the same length and were located along the same location within air-curtain  270 . Air straightener  240  may include gravity orientation mechanisms, similar to air straightener  140 , or may employ a geometry that is configured to orient air straighter  240  in the primary direction of air-curtain  270  when temperature controlled case is in the normal operating condition. As air straighteners  240  and/or flow guides  260  are repositioned, the luminaires may be correspondingly repositioned such that shelves  210  remain illuminated. 
     Unlike air-curtain  170 , the primary direction of air-curtain  270  may not be substantially perpendicular to a mounting surface for temperature controlled case  200 . In one embodiment, the primary direction of air-curtain  270  is offset fifteen degrees from a line perpendicular to the mounting surface for temperature controlled case  200 . Such orientation of air-curtain  270  is common for temperature controlled cases that display meat products. 
     Referring to  FIG. 3 , a number of shelves, shown as shelves  310 , are shown individually coupled to air straighteners, shown as air straighteners  340 . Air straighteners  340  are shown to individually include a beam, shown as support beam  350 , and a guide, shown as flow guide  360 . Air straighteners  340  are configured such that flow guides  360  are disposed in a region, shown as air-curtain  370 . As particularly shown in  FIG. 3 , flow guides  360  may contain luminaires configured to illuminate particular shelves  310 . For example, flow guide  360  mounted on a first shelf  310  may illuminate a second shelf  310  directly below the first shelf  310 . Also shown in  FIG. 3 , flow guides  360  may be located at various locations within air-curtain  370  depending on the particular shelf  310  that flow guide  360  is coupled to. Depending on the location, flow guides  360  may have various effects on air-curtain  370 . Similarly, depending on the location, luminaires within flow guides  360  may have various illumination effects on shelves  310 . 
     Referring now to  FIGS. 4-5 , a guide, shown as flow guide  460 , includes a lighting module, shown as luminaire  484 , that is electrically coupled to flow guide  460 . Flow guide  460  may be electrically coupled to an air straightener and/or a temperature controlled case and configured to provide electrical power to luminaire  484 . Flow guide  460  may be incorporated onto an air straightener (e.g., air straightener  140 , air straightener  240 , etc.) coupled to a shelf (e.g., shelf  110 , shelf  210 , etc.) and luminaire  484  may be configured to illuminate products (e.g., products  105 , etc.) on the shelf. A top shelf of a temperature controlled case may be illuminated by luminaire  484 , ambient light, and/or an auxiliary light positioned proximate a top cornice of the temperature controlled case. According to various embodiments, flow guide  460  includes a first channel (e.g., slot, recess, etc.), shown as lower channel  448 , and a second channel (e.g., slot, recess, etc.), shown as upper channel  458 . Lower channel  448  may include a wall, shown as lower wall  464 , an edge, shown as bottom retaining edge  466 , and a wall, shown as middle wall  468 . Upper channel  458  may include a groove (e.g., channel, slot, etc.), shown as upper groove  472 , an edge, shown as upper edge  474 , another edge, shown as top retaining edge  476 , another groove (e.g., channel, slot, etc.), shown as lower groove  478 , and another edge, shown as middle edge  482 . Luminaire  484  may include a number of illumination elements (e.g., light, lamp, etc.), shown as LEDs  486 , and a circuit board, shown as printed circuit board (PCB)  488 . LEDs  486  and PCB  488  may be electrically coupled to luminaire  484 , and thereby to flow guide  460 . Flow guide  460  may further include a cover (e.g., shield, etc.), shown as lens  490 . Lens  490  may include an edge, shown as upper lens edge  492  (e.g., upper edge, lens edge, etc.), a projection (e.g., protuberance, etc.), shown as upper leg  494 , another projection, shown as lower leg  496 , and another edge, shown as lower lens edge  498  (e.g., lower edge, lens edge, etc.). 
     According to various embodiments, luminaires  484  facilitate a lower temperature of products in a temperature controlled case compared to a typical temperature controlled case. Luminaire  484  may facilitate illumination of products along the entire length of various shelves in a temperature controlled case. In some embodiments, luminaires  484  facilitate uniform placement of products on shelves. Further, luminaires  484  may facilitate increased storage capacity of the shelves compared to shelves of a typical temperature controlled case. For example, typical temperature controlled cases may utilize a tiered scheme when determining lengths of multiple shelves in the typical temperature controlled case. For example, the typical temperature controlled case may have a top shelf, a middle shelf with a length greater than the length of the top shelf, and a bottom shelf with a length greater than the length of the middle shelf. This tiered scheme results in less than optimal capacity, utilization, and efficiency of the typical temperature controlled case. 
     In various embodiments, luminaire  484  is coupled to lower channel  448  and lower channel  448  is configured to receive PCB  488 . In some embodiments, an interface between PCB  488  and lower channel  448  includes thermal grease (e.g., CPU grease, heat paste, heat sink compound, thermal paste, etc.). The thermal grease may be configured to increase heat transfer between PCB  488  and flow guide  460 . In some applications, PCB  488  is secured to lower channel  448  through the use of an adhesive (e.g., glue, epoxy, etc.). In other applications, PCB  488  is secured to lower channel  448  through the use of fasteners (e.g., screws, bolts, etc.) and/or retaining clips. PCB  488  may be defined by a length, a width less than the length, and a thickness less than the width. The length of PCB  488  may be less than the length of flow guide  460 . The width of PCB  488  may be less than the distance from lower wall  464  to middle wall  468 . The thickness of PCB  488  may be less than the distance between bottom retaining edge  466  and lower channel  448 . However, the distance between bottom retaining edge  466  and lower channel  448  may be sized to receive PCB  488 . According to various embodiments, PCB  488  is retaining within lower channel  448  through a force exerted by a combination of upper leg  494  and lower leg  496  on PCB  488 . For example, upper leg  494  and lower leg  496  may cause PCB  488  to be in contact with lower channel  448 . Upper leg  494  and lower leg  496  may have an un-deformed shape when lens  490  is not installed in flow guide  460  containing PCB  488 . When installed in flow guide  460  containing PCB  488 , upper leg  494  and/or lower leg  496  may have a deformed shape and may individually exert a force on PCB  488  biasing PCB  488  against lower channel  448  due to a difference between the un-deformed shape and the deformed shape of upper leg  494  and/or lower leg  496 . 
     According to various embodiments, lens  490  is coupled to flow guide  460  through an interaction between lower lens edge  498  and bottom retaining edge  466  and an interaction between upper lens edge  492  and top retaining edge  476 . In some embodiments, an interaction between upper edge  474  and upper lens edge  492  assists in coupling lens  490  to flow guide  460 . An interaction between upper leg  494  and PCB  488  and an interaction between lower leg  496  and PCB  488  may assist in coupling lens  490  to flow guide  460 . 
     Flow guide  460  may be coupled to a shelf (e.g., shelf  110 , shelf  210 , etc.) of a temperature controlled case (e.g., temperature controlled case  100 , temperature controlled case  200 , etc.) through the use of a support arm (e.g., support arm  150 , support arm  250 , etc.) of an air straightener (e.g., air straightener  140 , air straightener  240 , etc.) coupled to the shelf and to flow guide  460 . In some applications, multiple support arms are used to couple flow guide  460  to the shelf. In various embodiments, the support arm may couple to flow guide  460  through the interaction of the support arm with upper channel  458 , upper groove  472 , lower groove  478 , upper edge  474 , and middle edge  482 . In some embodiments, the support arm may be slidably engaged with upper channel  458 , lower groove  478 , and upper groove  472 . While the support arms may be coupled to upper channel  458  and luminaire  484  may be coupled to lower channel  448 , it is understood that the support arms may be coupled to lower channel  448  and luminaire  484  may be coupled to upper channel  458 . According to various embodiments, flow guide  460  is coupled to a support arm through the insertion of fasteners through the support arm and into upper groove  472  and lower groove  478 . In some embodiments, upper groove  472  and lower groove  478  are threaded and configured to receive a threaded fastener (e.g., bolt, screw, etc.). In other embodiments, upper groove  472  and/or lower groove  478  include a threaded post configured to be inserted into holes in the support arm. In this embodiment, the support arm is coupled to the upper groove  472  and/or lower groove  478  through the use of a nut on the threaded post. 
     According to various embodiments, multiple flow guides  460  may be utilized on a temperature controlled case (e.g., temperature controlled case  100 , temperature controlled case  200 , etc.). For example, a temperature controlled case may include an air straightener for every shelf, and have flow guides  460  individually mounted to every air straightener. Flow guides  460  may have a length corresponding to a length of a shelf that the flow guide  460  is coupled to. For example, if a shelf that flow guide  460  is coupled to has a length of two meters, flow guide  460  may have a length of substantially two meters. In other examples, multiple flow guides  460  may be coupled to the same shelf. For example, along the length of the shelf, a first flow guide  460  may only occupy a certain section of the shelf while a second flow guide  460  occupies a different section of the shelf. Further, shelves may contain portions without flow guides  460 . 
     In some examples, PCB  488  may have a length less than or equal to a length of flow guide  460 . For example, flow guide  460  may contain multiple PCBs  488 . In one example, flow guide  460  contains one PCB  488  with a length substantially equal to a length of flow guide  460 . Further, flow guide  460  may contain portions without PCB  488 . In various embodiments, LEDs  486  are coupled to PCB  488  and disposed along the length of PCB  488  at regular intervals (e.g., every five centimeters, every ten centimeters, etc.). For example, for a particular PCB  488  having a length of forty-eight centimeters, forty-six LEDs  486  may be coupled to PCB  488  at regular intervals of two centimeters. Similarly, irregular or varying intervals between LEDs  486  may be utilized. In one example, PCB  488  may be defined by a first end section, a middle section, and a second end section. Following this example, a spacing between LEDs  486  in the middle section may be smaller than a spacing between LEDs  486  in either the first end section or the second end section. Further, some portions of PCB  488  may not have any LEDs  486 . 
     Depending on the application, PCB  488  may incorporate surface-mount devices (SMDs) in addition to LEDs  486 . SMDs may be resistors, capacitors, diodes, rectifiers, fans, heat sinks, transistors, multi discrete modules, voltage suppressors, processors, memory units, thyristors, and other electronic devices such that PCB  488  may be tailored for a target application. PCB  488  may be defined as having a frontal surface in confronting relation with lower channel  448  or upper channel  458 , and a rear surface opposite the frontal surface and proximate lens  490 . In some examples, PCB  488  may contain LEDs  486  and other surface-mount devices (SMDs) only the rear surface of PCB  488  directed towards products on a shelf. According to these examples, the frontal surface of PCB  488  may not contain LEDs  486  or SMDs. In other examples, PCB  488  contains LEDs  486  and/or other SMDs on both the frontal surface and the rear surface of PCB  488 . Other SMDs that could be included on PCB  488  include capacitors, resistors, wiring, heat sinks, display screens, potentiometers, etc. 
     In some applications, flow guide  460  may be configured to be aesthetically pleasing. Flow guides  460  may be defined as having an interior lateral surface proximate products in a temperature controlled case, and an exterior lateral surface opposite the interior lateral surface. In some embodiments, the exterior lateral surface of flow guides  460  is configured to substantially cover LEDs  486 , PCB  488 , and all other SMDs. For example, while LEDs  486  may illuminate products, LEDs  486 , PCB  488  and all other SMDs may not be directly observed by a customer when a temperature controlled case is in use. In one embodiment, luminaires  484  are configured such that a customer viewing an air straightener having luminaire  484  from outside of a temperature controlled case may not directly see LEDs  486 . The configuration of luminaires  484  may reduce glare experienced by customers during use of a temperature controlled case compared to lighting elements of a typical temperature controlled case. 
     In some applications, shelves of a temperature controlled case are of different lengths (e.g., fifty centimeters, fifty-six centimeters, sixty-one centimeters, etc.). Luminaires  484  may advantageously facilitate adequate lighting of products on each of the shelves such that a front face of products displayed on the shelves may readily be visible by a customer. 
     In various embodiments, luminaires  484  have an illumination target. The illumination target may correspond to a desired location of illumination (e.g. lighting, visibility, etc.), such as an arrangement of products on a particular shelf. For example, it may be desirable to be able to clearly see products located on a rearward portion of the shelf. The illumination target may be a concentration (e.g., area, etc.) of illumination emitted (e.g., produced, dispersed, etc.) from LEDs  486 . For example, LEDs  486  may be focused (e.g., directed, concentrated, etc.) on the illumination target. Luminaires  484  may have a pre-set illumination target or may have an illumination target that is selectively repositionable. For example, the illumination target may be a row of products on a particular shelf directly below a particular air straightener having luminaire  484 . Depending on the length of the particular shelf, luminaire  484  may need to be repositioned, or interchanged with a different luminaire  484 . For example, the air straightener may allow luminaire  484  to be selectively repositioned (e.g., through movement of a support arm or flow guide). In another example, luminaire  484  may be selectively repositionable within flow guide  460 . For example, luminaire  484  may be selectively repositionable along lower channel  448 . However, in some applications it may be more desirable to interchange luminaire  484  with a different luminaire having a different illumination target. For example, one luminaire  484  may produce an illumination target that corresponds to a length of a shelf of approximately fifty centimeters while another luminaire  484  may produce an illumination target that corresponds to a length of a shelf of approximately fifty-six centimeters. 
     In some applications, luminaires  484  may be mounted to shelves of a temperature controlled case without the use of air straighteners. Rather, luminaires  484  may be mounted to shelves of the temperature controlled case through the use of mounting hardware. The mounting hardware may be a number of brackets configured to couple luminaires  484  to shelves of the temperature controlled case and fasteners to secure the brackets thereto. 
     According to one application, a temperature controlled case may have a first shelf having a first air straightener and a first luminaire  484 , a second shelf having a second air straightener and a second luminaire  484 , and a third shelf having a third air straightener and a third luminaire  484 . According to this application, the first luminaire  484  may be configured to illuminate products on the second shelf and the second luminaire  484  may be configured to illuminate products on the third shelf. In other examples, an illumination target may be products on the particular shelf directly above a particular air straightener having luminaire  484 . In some other examples, luminaire  484  may have multiple illumination targets. In these examples, individual LEDs  486  may individually have an illumination target. It is understood that wherein an illumination target of luminaire  484  is described it is similarly an illumination target of at least an individual LED  486 . Similarly, it is understood that an illumination target of LEDs  486  is an illumination target of luminaire  484 . In one example, luminaire  484  may be configured to have multiple illumination targets on a number of shelves above and/or below luminaire  484 . In an application where luminaires  484  individually have two illumination targets, luminaires  484  may individually contain a first number of LEDs  486  having a first illumination target and a second number of LEDs  486  having a second illumination target different from the first illumination target. In other examples, LEDs  486  may individually have multiple illumination targets. For example, LEDs  486  on a first shelf may illuminate products on the first shelf and products on a second shelf below the first shelf. In another example, LEDs  486  on a first shelf may illuminate products on a second shelf below the first shelf and a third shelf below the first shelf. In yet another example, LEDs  486  on a first shelf may illuminate products on a second shelf above the first shelf. In an alternative example, luminaire  484  may be configured to illuminate products on the shelf to which the air straightener having luminaire  484  is coupled. 
     In one embodiment, air straighteners (e.g., air straighteners  140 , air straighteners  240 , etc.) of a temperature controlled case are selectively repositionable between a number of angles relative to the primary direction of travel of an air-curtain (e.g., air-curtain  170 , air-curtain  270 , etc.). According to this embodiment, the air straighteners are repositionable when temperature controlled case  100  is reconfigured to provide necessary control of the air-curtain. In other embodiments, the air straighteners, flow guides (e.g., flow guides  460 ) and/or luminaires  484  are reconfigurable such that an illumination target of LEDs  486  may be selectively repositioned. In one example, a temperature controlled case may have shelves that are reconfigured from one angle relative to the mounting surface to another angle relative to the mounting surface. In order to account for this change, the air straighteners may be repositioned. Further, when shelves are reconfigured, it may be desirable to relocate the illumination target of LEDs  486 . Accordingly, the air straighteners and/or luminaires  484  may be reconfigured such that an illumination target of LEDs  486  is located in a desired location (e.g., a front face of a product, etc.). 
     Depending on the configuration of a temperature controlled case, various shelves of the temperature controlled case may be oriented at different angles relative to a primary mounting surface of the temperature controlled case. In these applications, luminaires  484  and/or air straighteners may be repositioned such that products (e.g., products  105 ) are adequately illuminated. In some applications, it may be desirable to reconfigure a temperature controlled case thereby changing an angle of a shelf. According to an embodiment where the reconfigured temperature controlled case include luminaires  484 , luminaires  484  may be selectively repositioned such that the illumination targets of luminaires  484  correspond with new locations of the shelves. 
     According to various embodiments, flow guides  460  are configured to provide cooling and heat dissipation to luminaires  484 . In one embodiment, flow guides  460  resemble a heat sink (e.g., pin fin, straight fin, flared fine, etc.). In order to facilitate heat dissipation, flow guides  460  may be painted (e.g., black) or coated such that heat dissipation is maximized. In some embodiments, flow guides  460  may be placed in a portion of an air-curtain (e.g., air-curtain  170 , air-curtain  270 , etc.) in confronting relation with ambient air (e.g., air from outside of a temperature controlled case). In these embodiments, heat from luminaire  484  may be transition from luminaire  484  to flow guide  460  through the air-curtain and into the ambient environment. These embodiments may facilitate increased temperature reduction of the air-curtain while luminaires  484  are utilized. 
     In some applications, it may be desirable for flow guides  460  and/or luminaires  484  to be retrofit on typical temperature controlled cases having air straighteners. In this manner, the typical temperature controlled cases may facilitate increased illumination of products on shelves providing for a more desirable temperature controlled case. For example, a previous air straightener may be removed and a new air straightener having luminaire  484  may be installed. Similarly, flow guides of a previous air straightener may be removed and replaced with flow guides  460  individually having luminaire  484 . In other applications, luminaires  484  may be individually retrofit into previous air straighteners. In some embodiments, luminaires  484  are releasably retained (e.g., snap fit, snapped on, clipped on, etc.) to air straighteners and/or flow guides (e.g., flow guides  460 , etc.). In other embodiments, luminaires are fastened to air straighteners and/or flow guides. 
     According to various embodiments, it may be desirable to replace and/or upgrade various components of luminaire  484 . In one example, it may be desirable to increase the intensity of light provided by luminaire  484 . According to this example, a user may remove luminaire  484  from flow guide  460  and reinsert a new luminaire  484  configured to provide the desired intensity of light within flow guide  460 . The user may remove luminaire  484  by first removing lens  490 . After removing lens  490 , the user may slide luminaire  484  out of flow guide  460 . Alternatively, removing lens  490  may allow the user to rotate luminaire  484  out from lower channel  448 . In some applications, it may be possible to individually replace and/or upgrade LEDs  486 . In these applications, a user may remove luminaire  484  from flow guide  460 , and may interchange current LEDs  486  for new LEDs  486 . The user may utilize similar processes to replace and/or upgrade PCB  488 . 
     In some applications, luminaires  484  may be configured to provide illumination targets in a certain location defined by an angle and distance from flow guide  460 . According to these applications, when reconfiguring a temperature controlled case containing luminaires  484 , it may be desirable to replace luminaires  484  with different luminaires  484  having illumination targets corresponding with new locations of the shelves of the temperature controlled case. In some applications, one or more support arms of an air straightener having luminaires  484  may have a telescoping mechanism configured to selectively alter the length of the support arm(s). In these applications, the illumination target of luminaires  484  may be altered by selectively changing the length of the support arm(s). 
     When reconfiguring a temperature controlled case it may be desirable to change the color of LEDs  486 . In these applications, previous LEDs  486  may be replaced with LEDs  486  having a more desirable color. As technology advances, it may be desirable to replace luminaire  484  with a luminaire  484  having a higher efficiency and/or providing increased capabilities. For example, luminaire  484  may be configured to utilize LEDs  486  that are ultra violet. In addition to luminaire  484 , lens  490  may also be replaced and/or upgraded. For example, luminaire  484  may initially have a clear (e.g., transparent, etc.) lens  490 . However, after a period of time, it may be more desirable for luminaire  484  to utilize a frosted (e.g., translucent, etc.) lens  490 . Accordingly, the clear lens  490  may be removed from flow guide  460  and the frosted lens  490  may be installed in flow guide  460 . 
     While not explicitly shown, it is understood that luminaires  484  may incorporate additional electronic technology necessary and desirable for the operation of LEDs  486  and/or PCBs  488 . For example, electrical wiring may electrically couple luminaires  484  to a temperature controlled case and further to a power grid. Luminaires  484  may also be coupled to an LED driver, load resistor, and/or an auxiliary power supply. Luminaires  484  may include sensors (e.g., temperature sensors, humidity sensors, air flow sensors, motion sensor, illumination sensors, etc.) and/or an electrical consumption meter (e.g., watt-hour meter, etc.). In one example, luminaires  484  include illumination sensors that modulate output of luminaires  484  according to ambient lighting conditions. It is understood that luminaires  484  may also contain additional capabilities. For example, luminaires  484  may have an energy conservation (e.g., energy saving, sleep, etc.) mode. In the energy conservation mode, luminaires  484  may be configured to provide no or minimal illumination, thereby consuming little electrical power. Luminaires  484  may enter energy conservation mode after a programmed time (e.g., when the store closes, etc.) or after a period of time since the last use of the temperature controlled case. The use of the temperature controlled case may be monitored by a motion sensor. 
     In some examples, luminaires  484  may be controlled directly on a temperature controlled case (e.g., through the use of a button, touch pad, etc.). In other examples, luminaires  484  may be controlled by a control device isolated from luminaires  484 . In some examples, luminaires  484  of multiple temperature controlled cases may be controlled by a control device isolated from any of luminaires  484 . For example, luminaires  484  may wirelessly transmit a status (e.g., on, off, energy conservation mode, repair needed, etc.), parameters (e.g., energy consumption, illumination output, operating temperature, etc.), and sensor data (e.g., temperature inside the temperature controlled case, air speed of an air-curtain, humidity, usage, ambient lighting conditions, etc.) to the control device. The control device may be a web application that may be accessed through an application on a mobile device (e.g., phone, tablet, etc.) or a computer (e.g., laptop, desktop, etc.). 
     In various embodiments, flow guide  460  is constructed from extruded aluminum. In other embodiments, flow guide  460  is constructed from plastic or a polymeric compound or blend. For example, flow guide  460  may be constructed from unfilled plastic or glass-filled plastic. Similarly, lens  490  may be constructed from plastic or a polymeric compound or blend. In some embodiments, lens  490  is constructed from a resin. In an alternative embodiment, lens  490  is constructed from glass (e.g., tempered, frosted, etc.). 
     According to various embodiments, PCB  488  may be a printed circuit board having a metal substrate. The metal substrate may be aluminum, aluminum clad, aluminum base, metal clad, insulated metal substrate, and/or thermally conductive. The metal substrate may provide increased heat transfer. PCB  488  may be flexible. In other embodiments, PCB  488  may be a printed circuit board having a FR-4 (e.g., glass-reinforced epoxy) substrate. Additionally, LEDs  486 , PCB  488  and flow guide  460  may include plated metal vias (e.g., through hole, blind, buried, etc.) thereby increasing heat transfer from luminaire  484 . 
     While luminaire  484  has been shown as described to use surface-mount-technology and SMDs, it is understood that through-hole style components, devices, and circuit boards could similarly be used. For example, PCB  488  may be replaced with a through-hole style circuit board. In this case, flow guide  460  may be constructed from an insulating material (e.g., plastic, etc.) to prevent shorting of any soldered connections. 
     Referring to  FIG. 6 , a third display case, shown as temperature controlled case  600  includes a third air discharge, shown as air-curtain discharge  620 , a third air return, shown as air-curtain return  630 , and a third air straightener, shown as air straightener  640 . Air straightener  640  may include a third beam, shown as support arm  650 , and a third guide, shown as flow guide  660 . In operation, a third air flow, shown as air-curtain  670 , flows between air-curtain discharge  620  and air-curtain return  630 , and is defined by a travel between air-curtain discharge  620  and air-curtain return  630 . The primary direction of air-curtain  670  may be a centerline of air-curtain  670 . It is understood that the foregoing description of temperature controlled case  100 , air-curtain discharge  120 , air-curtain return  130 , air straighteners  140 , support arms  150 , flow guides  160 , air-curtain  170 , temperature controlled case  200 , air-curtain discharge  220 , air-curtain return  230 , air straighteners  240 , support arms  250 , flow guides  260 , air-curtain  270 , and flow guides  460  similarly applies to and describes temperature controlled case  600 , air-curtain discharge  620 , air-curtain return  630 , air straightener  640 , support arm  650 , flow guide  660 , and air-curtain  670 , where similar symbols correspond to similar components. 
     Temperature controlled case  600  may not include any shelves. Temperature controlled case  600  may be desirable for display products such as deli meats and cheeses, stacked boxes (e.g., beverage containers, etc.), bulk produce displays, floral arrangement displays, arrays of vases, and other suitable display products such that temperature controlled case  600  may be tailored for a target application. In one embodiment, temperature controlled case  600  includes a peg-hook display configured to facilitate the hanging of display products. According to various embodiments, air straightener  640  is mounted to temperature controlled case  600 . For example, air straightener  640  may be suspended from a rod, wire  661 , or support arms  650  attached to temperature controlled case  600 . Unlike air straighteners  140  and air straighteners  240 , air straighter  640  may not be mounted to a shelf. According to various embodiments, a luminaire, such as luminaire  484 , mounted within flow guide  660  may have multiple LEDs, such as LEDs  486 , such that multiple or large illumination targets are possible. 
     According to various embodiments, flow guide  660  is made from at least partially clear (e.g., transparent, partially-transparent, translucent, etc.) plastic or other material. In one embodiment, flow guide  660  is a metal strip. In addition to or in replace of the capabilities of air straighteners  140 , air straightener  640  may have rotational capability such that air straightener  640  is within air-curtain  670  under a normal operating condition but is removed from air-curtain  670  when temperature controlled case  600  is in use by a user. For example, air straightener  640  may be rotatable within a joint such that air straightener  640  may be rotated by a slight force transmitted by an object such as display product being loaded into or unloaded from temperature controlled case  600 . According to various embodiments, air straightener  640  includes a luminaire similar to luminaire  484  configured to illuminate the inside of temperature controlled case  600 . Similar to air straightener  140 , air straightener  640  may be selectively repositionable. Air straightener  640  may include gravity orientation mechanisms, similar to air straightener  140 , or may employ a geometry that is configured to orient air straighter  640  in the primary direction of air-curtain  670  when temperature controlled case  600  is in the normal operating condition. In this manner, air straightener  640  may be protected from inadvertent damage throughout use of temperature controlled case  600 . In another example, air straightener  640  may be coupled to a device (e.g., motor, solenoid, linear actuator, actuator, etc.) configured to rotate air straightener  640  to a stored position when temperature controlled case  600  is in use as detected by, for example, a sensor or switch located on or within temperature controlled case  600 . Air straightener  640  may be angularly displaced relative to air-curtain  670 . For example, air straightener  640  may be angled fifteen degrees towards or away from a door of temperature controlled case  600 . 
     In some applications, it may be desirable to provide the functionality of temperature controlled case  600  to a typical temperature controlled case. Due to the simplicity of air straightener  640 , it may be possible to retrofit air straightener  640  on a variety of makes and models of typical temperature controlled cases in the field (e.g., at a supermarket, etc.). Accordingly, air straightener  640  may be readily retrofit on typical temperature controlled cases such that the added functionality of air straightener  640  may be provided to the typical temperature controlled cases. 
     As shown in  FIG. 7 , a fourth display case, shown as temperature controlled case  700  includes a third number of shelves, shown as shelves  710 , a fourth air discharge, shown as air-curtain discharge  720 , and a fourth air return, shown as air-curtain return  730 . Individually, shelves  710  may include a fourth guide, shown as flow guide  760 . In operation, a fourth air flow, shown as air-curtain  770 , flows between air-curtain discharge  720  and air-curtain return  730 , and is defined by a travel between air-curtain discharge  720  and air-curtain return  730 . The primary direction of air-curtain  770  may be a centerline of air-curtain  770 . Temperature controlled case  700  may include a door proximate flow guides  760 . It is understood that the foregoing description of temperature controlled case  100 , air-curtain discharge  120 , air-curtain return  130 , air straighteners  140 , support arms  150 , flow guides  160 , air-curtain  170 , temperature controlled case  200 , shelves  210 , air-curtain discharge  220 , air-curtain return  230 , air straighteners  240 , support arms  250 , flow guides  260 , air-curtain  270 , flow guide  460 , temperature controlled case  600 , air-curtain discharge  620 , air-curtain return  630 , air straightener  640 , support arm  650 , flow guide  660 , and air-curtain  670  similarly applies to and describes temperature controlled case  700 , shelves  710 , air-curtain discharge  720 , air-curtain return  730 , flow guides  760 , and air-curtain  770 , where similar symbols correspond to similar components. 
     In some applications, it may be desirable to incorporate an air straightening design directly into shelves  710  of temperature controlled case  700 . Accordingly, temperature controlled case  700  includes flow guides  760  disposed along one edge of shelves  710 . In one embodiment, shelf  710  is configured to receive flow guide  760  along one edge of shelf  710 . Shelves  710  may include holes configured to facilitate the transfer of air-curtain  770  through shelves  710 . In one embodiment, shelves  710  and flow guides  760  cooperate to extend air-curtain  770  at a target location proximate shelves  710 . In various applications, shelves  710  may be of differing lengths such that flow guides  760  are located at various locations within air-curtain  770 . Accordingly, flow guides  760  and shelves  710  may cooperate to control air-curtain  770  at various locations within air-curtain  770 . In some embodiments, temperature controlled case  700  includes one type of flow guide  760  on one shelf  710  and another type of flow guide  760  on another shelf  710 . According to this embodiment, the first type of flow guide  760  produces a first effect on air-curtain  770  and the second type of flow guide  760  produces a second effect on air-curtain  770  that may be different from the first effect. Flow guides  760  may be a leading edge of shelf  710 , a channel or flange, or any other suitable structure such that temperature controlled case  700  may be tailored for a target application. Flow guides  760  may incorporate price tags, product information, bar codes, or other components. 
     As shown in  FIG. 7 , shelves  710  are of different lengths. Accordingly, flow guides  760  may incorporate luminaires, similar to luminaires  484 . In this manner, flow guides  760  may adequately illuminate products on shelves  710 . Each flow guide  760  may have a luminaire configured to illuminate a particular shelf  710 . 
     Flow guides  760  may be angled at any angle relative to a mounting surface for temperature controlled case  700 . In one embodiment, flow guides  760  are angled substantially perpendicular to the mounting surface for temperature controlled case  700 . In other examples, flow guides  760  are angled towards or away from the door of temperature controlled case  700 . In some applications, it may be desirable for the angle of flow guides  760  to substantially match the angle of air-curtain  770 , such that flow guides  760  are oriented substantially parallel to the primary direction of air-curtain  770 . For example, flow guides  760  may be angled fifteen degrees from the primary direction of air-curtain  770  towards the door. In various embodiments, flow guides  760  are selectively repositionable between a number of fixed angular positions. In some embodiments, flow guides  760  are integrated within shelves  710 . In other embodiments, flow guides  760  are selectively removable and replaceable from shelves  710 . According to these embodiments, a user can change the control of air-curtain  770  simply by interchanging flow guide  760  with a different flow guide  760 . 
       FIGS. 8-9  illustrate a number of temperature controlled cases  700 , shown as array of cases  800 . As shown, temperature controlled case  700  may include a number of fourth beams, shown as support arms  850 , and a first number of channels, shown as air channels  880 . As shown in  FIG. 8 , shelves  710  may or may not include air channels  880 . Air channels  880  may be configured to facilitate the passage of air-curtain  770  through shelves  710 . Support arms  850  may be configured to support flow guides  760 . Air channels  880  may be square shaped, rectangular shaped, circular shaped, triangular shaped, polygonal shaped, or any other shape or combination thereof such that temperature controlled case  700  is tailored for a target application. Through the cooperation of shelves  710  and air channels  880 , control of air-curtain  770  is facilitated at various points such that air-curtain  770  may be tailored for a target application. For example, air-curtain  770  may be staggered, tapered, or narrowed, or any combination thereof, such that temperature controlled case  700  is tailored for a target application. As shown in  FIG. 9 , a product, shown as product  905 , may be illuminated by luminaires incorporated into flow guides  760 . Through the use of luminaires in flow guides  760 , products  705  may be positioned along the front portion of shelves  710  while vital information about product  905  (e.g., product details, brand logo, etc.) is illuminated by the luminaires. 
     As shown in  FIGS. 10-13 , a fourth shelf, shown as shelf  1010 , includes a fourth air straightener, shown as air straightener  1040 . Air straightener  1040  may include a first mechanism, shown as gravity orientation mechanism  1042 , a fifth beam, shown as support arm  1050 , and a fifth flow guide, shown as flow guide  1060 . Flow guide  1060  may contain a luminaire similar to luminaire  484 . Gravity orientation mechanism  1042  may include a first pivot, shown as pivot  1052 , and a first stop, shown as stop  1054 . In various embodiments, shelf  1010  may be incorporated into any of temperature controlled case  100 , temperature controlled case  200 , temperature controlled case  600 , temperature controlled case  700 , and any other suitable temperature controlled case. The temperature controlled case may include any number of shelves  1010 . For example, the temperature controlled case may include four shelves  1010 . In many applications, it may be desirable to have the ability to reconfigure a temperature controlled case (e.g., temperature controlled case  100 , temperature controlled case  200 , temperature controlled case  600 , temperature controlled case  700 , etc.) at various points throughout the useful life of the temperature controlled case. For example, a user of the temperature controlled case may initially configure the temperature controlled case to display meat products; however, after observing lower demand for meat products, the user may wish to utilize the temperature controlled case to display fresh produce. According to various embodiments, shelf  1010  and air straightener  1040  are reconfigurable by the user such that the temperature controlled case may be tailored for various applications. 
     In some applications, it may be desirable for shelf  1010  to be oriented at an angle. For example, shelf  1010  may be oriented at an angle such that display products may be arranged in a more aesthetically pleasuring or ergonomical manner. As shown in  FIG. 12 , shelf  1010  is oriented at an angle ϕ. When oriented at an angle (e.g., ϕ, etc.), gravity orientation mechanism  1042  may be configured to orient flow guide  1060  such that flow guide  1060  is perpendicular with a direction of gravity. Gravity orientation mechanism  1042  may thereby facilitate control of an air-curtain and illumination of products on shelves after a temperature controlled case has been reconfigured. 
     In some examples, a portion of flow guide  1060  may be constructed or weighted in order to orient flow guide  1060  in the direction of gravity. In various embodiments, flow guide  1060  is pivotable (e.g., rotatable, movable, etc.) about pivot  1052 . Pivot  1052  may be a mechanism such as a pin, a bolt, a beam, a bar, a stud, a wire, or any other suitable mechanism such that shelf  1010  may be tailored for a target application. In some applications, it may be desirable to limit the rotation of flow guide  1060 . In some embodiments, gravity orientation mechanism  1042  includes stop  1054  configured to limit the rotation of flow guide  1060 . In various embodiments, stop  1054  is located on support arm  1050 . Stop  1054  may be a mechanism such as a pin, a bolt, a beam, a bar, a stud, a wire, or any other suitable mechanism such that shelf  1010  may be tailored for a target application. Shelf  1010  may have two support arms  1050  each optionally including stop  1054 . Stop  1054  may be configured to provide possible orientations for flow guide  1060 . For example, a location of stop  1054  may correspond to a twenty degree orientation (e.g., ϕ is equal to twenty degrees) of shelf  1010 . In some embodiments, the location of stop  1054  may correspond to a zero degree orientation (e.g., ϕ is equal to zero degrees) of shelf  1010 . Air straightener  1040  may accommodate multiple positions of stop  1054  and/or pivot  1052 . For example, support arm  1050  may include a number of holes configured to selectively receive pivot  1052  and/or stop  1054 . According to this example, pivot  1052  and/or stop  1054  may be selectively repositionable within any of the holes. Pivot  1052  and/or stop  1054  may be retained within flow guide support arm  1050  through a structural mechanism (e.g., through a threaded interface, a snap fit, a friction fit, etc.), magnetic mechanism, adhesive mechanism, permanent mechanism (e.g., welded, riveted, etc.), or any other suitable mechanism such that shelf  1410  may be tailored for a target application. In some embodiments, shelf  1010  does not include stop  1054 . 
     As shown in  FIGS. 14-16 , a fifth shelf, shown as shelf  1410 , includes a fifth air straightener, shown as air straightener  1440 , and a second mechanism, shown as cam-track mechanism  1444 . Air straightener  1440  may include a sixth beam, shown as support arm  1450 , and a sixth flow guide, shown as flow guide  1460 . Flow guide  1460  may contain a luminaire similar to luminaire  484 . Cam-track mechanism  1444  may include a second pivot, shown as pivot  1452 , a second stop, shown as stop  1454 , a first slot, shown as slot  1456 , a second slot, shown as track  1458 , and a number of third slots, shown as position slots  1462 . In various embodiments, shelf  1410  may be incorporated into any of temperature controlled case  100 , temperature controlled case  200 , temperature controlled case  600 , temperature controlled case  700 , and any other suitable temperature controlled case. The temperature controlled case may include any number of shelves  1410 . For example, the temperature controlled case may include four shelves  1410 . 
     Similar to shelf  1010 , shelf  1410  may be reconfigurable. Rather than using a gravity orientation mechanism, such as gravity orientation mechanism  1042 , shelf  1410  may utilize cam-track mechanism  1444  to reposition flow guide  1460 . Pivot  1452  may be a mechanism such as a pin, a bolt, a beam, a bar, a stud, a wire, or any other suitable mechanism such that shelf  1010  may be tailored for a target application. Stop  1454  may be a mechanism such as a pin, a bolt, a beam, a bar, a stud, a wire, or any other suitable mechanism such that shelf  1010  may be tailored for a target application. In various embodiments, pivot  1452  and/or stop  1454  are permanently attached to flow guide  1460 . For example, pivot  1452  and stop  1454  may be welded, threaded, or structurally integrated into flow guide  1460 . Flow guide  1460  may accommodate multiple positions of stop  1454  and/or pivot  1452 . For example, flow guide  1460  may include a number of holes configured to selectively receive pivot  1452  and/or stop  1454 . According to this example, pivot  1452  and/or stop  1454  may be selectively repositionable within any of the holes. Pivot  1452  and/or stop  1454  may be retained within flow guide  1460  through a structural mechanism (e.g., through a threaded interface, a snap fit, a friction fit, etc.), magnetic mechanism, adhesive mechanism, permanent mechanism (e.g., welded, riveted, etc.), or any other suitable mechanism such that shelf  1410  may be tailored for a target application. 
     When reconfiguring shelf  1410 , a user may manipulate flow guide  1460  such that pivot  1452  moves within slot  1456  and such that stop  1454  moves within track  1458 . To select an orientation of flow guide  1460 , the user may locate stop  1454  within any one of position slots  1462  such that the desired orientation of flow guide  1460  is obtained. Cam-track mechanism  1444  may include any number of position slots  1462  in any suitable configuration. In some embodiments, shelf  1410  includes two position slots  1462 . In other embodiments, shelf  1410  includes three position slots  1462 . In various embodiments, the locations of position slots  1462  correspond to possible orientations of flow guide  1460 . In some embodiments, the locations of position slots  1462  are configured to correspond to possible desired orientations of shelf  1410 . It is understood that the shape and size of slot  1456  is configured to facilitate the repositioning of stop  1454  within track  1458  and that any suitable shape and/or size of slot  1456  may be utilized. 
     In some applications, it may be desirable for shelf  1410  to be oriented at an angle. For example, shelf  1410  may be oriented at an angle such that display products may be arranged in a more aesthetically pleasuring or ergonomical manner. As shown in  FIG. 16 , shelf  1410  is oriented at an angle θ. When oriented at an angle (e.g., θ, etc.), cam-track mechanism  1444  may enable a user to selectively reposition flow guide  1460  in one of position slots  1462 . For example, one position slot  1462  may correspond to an angle of shelf  1410  of fifteen degrees (e.g., θ is fifteen degrees, etc.) while another position slot  1462  may correspond to an angle of shelf  1410  of zero degrees (e.g., θ is zero degrees, etc.). According to this example, shelf  1410  may be configured at fifteen degrees or zero degrees. In some embodiments, a first position slot  1462  may correspond to an angle of shelf  1410  of a first variable, x, (e.g., θ is equal to x, etc.), a second position slot  1462  may correspond to an angle of shelf  1410  of forty percent of the first variable, x, (e.g., θ is equal to forty percent of x, etc.), while a third position slot  1462  may correspond to an angle of shelf  1410  of zero degrees (e.g., θ is zero degrees, etc.). Cam-track mechanism  1444  may thereby facilitate control of an air-curtain and illumination of products on shelves after a temperature controlled case has been reconfigured. 
     As shown in  FIG. 17 , a track, shown as sliding track  1702 , includes a second number of channels, shown as channels  1715 , and a number of holes, shown as positioning holes  1725 . Sliding track  1702  may be configured to receive an insert within channels  1715 . Referring to  FIG. 18 , an insert, shown as sliding insert  1804  includes a third number of channels, shown as channels  1815 , a movable flap, shown as movable flap  1835 , and a protrusion (e.g. protuberance, stud, etc.), shown as position lock  1845 . In various embodiments, sliding track  1702  is configured to receive sliding insert  1804 . In some embodiments, channels  1715  are configured to cooperate with channels  1815  to provide a sliding interface between sliding track  1702  and sliding insert  1804 . 
     In various embodiments, sliding track  1702  and sliding insert  1804  cooperate to form a telescoping mechanism. The telescoping mechanism may be utilized to selectively reposition support arms (e.g., support arms  150 , support arms  250 , support arms  650 , support arms  850 , support arm  1050 , support arm  1450 , etc.) and/or shelves (e.g., shelves  110 , shelves  210 , shelves  710 , shelf  1010 , shelf  1410 , etc.) such that flow guides (e.g., flow guides  160 , flow guides  260 , flow guide  460 , flow guide  660 , flow guides  760 , flow guide  1060 , flow guide  1460 , etc.) may be positioned at a number of locations. For example, the shelves may be selectively repositioned such that the length of the shelves is within the inclusive range of 40.61 centimeters to 50.8 centimeters. In one embodiment with three shelves, the first shelf may be configured to have a length of 40.61 centimeters, the second shelf may be configured to have a length of 45.72 centimeters, and the third shelf may be configured to have a length of 50.8 centimeters. In various embodiments, positioning holes  1725  are configured to selectively receive position lock  1845 . In some embodiments, positioning holes  1725  and position lock  1845  are both substantially circular. In other examples, positioning holes  1725  and position lock  1845  may be substantially square, substantially triangular, substantially polygonal, or any suitable combination thereof. 
     In one embodiment, sliding track  1702  includes five positioning holes  1725 . In other examples, sliding track  1702  may include more or fewer positioning holes  1725 . For example, sliding track  1702  may include one, two, three, four, six, seven, eight, or more positioning holes  1725 . In various embodiments, positioning holes  1725  are spaced apart an equal distance from one another. In some embodiments, positioning holes  1725  are spaced 2.54 centimeters apart. In other embodiments, positioning holes  1725  are spaced 5.08 centimeters apart. In other examples, some positioning holes  1725  may not be spaced apart an equal distance from one another while other positioning holes  1725  are spaced apart an equal distance from one another. In various embodiments, the locations of positioning holes  1725  correspond to possible positions of the support arms (e.g., support arms  150 , support arms  250 , support arms  650 , support arms  850 , support arm  1050 , support arm  1450 , etc.) and/or the shelves (e.g., shelves  110 , shelves  210 , shelves  710 , shelf  1010 , shelf  1410 , etc.). 
     Repositioning of the support arms and/or the shelves may allow a user to reposition the flow guides (e.g., flow guides  160 , flow guides  260 , flow guide  660 , flow guides  760 , flow guide  1060 , flow guide  1460 , etc.). In various embodiments, sliding track  1702  and sliding insert  1804  are operable between a locked position where position lock  1845  is retained (e.g., secured, engaged, located, maintained, etc.) within one of positioning holes  1725  and an unlocked (e.g., released, disengaged, etc.) position where position lock  1845  is not retained within one of positioning holes  1725 . In some embodiments, movable flap  1835  is configured to bias position lock  1845  against sliding track  1702  such that position lock  1845  is retained within one of positioning holes  1725  when position lock  1845  is centered about one of positioning holes  1725 . Movable flap  1835  may bias position lock  1845  through a structural resistance, spring force, or other suitable means. 
     In operation, a user may unlock (e.g., release, disengage, etc.) position lock  1845  from one of positioning holes  1725  by applying a force to position lock  1845  that is greater than the bias provided by movable flap  1835  while simultaneously translating (e.g., moving, etc.) one of the support arms and/or the shelves. In some embodiments sliding track  1702  is mounted to the shelves while sliding insert  1804  is mounted to a temperature controlled case (e.g., temperature controlled case  100 , temperature controlled case  200 , temperature controlled case  600 , temperature controlled case  700 , etc.). In other embodiments sliding track  1702  is mounted to the temperature controlled case while sliding insert  1804  is mounted to the shelves. In some embodiments sliding track  1702  is mounted to the shelves while sliding insert  1804  is mounted to the support arms. In other embodiments sliding track  1702  is mounted to the support arms while sliding insert  1804  is mounted to the shelves. 
     It is understood that while channels  1715  are shown and described to be configured to cooperate with channels  1815  to provide a sliding interface between sliding track  1702  and sliding insert  1804 , that other suitable mechanisms and/or interfaces could be implemented between sliding track  1702  and sliding insert  1804 . For example, sliding track  1702  and sliding insert  1804  may incorporate a roller-track mechanism (e.g., one of sliding track  1702  and sliding insert  1804  includes rollers or wheels), a rack and pinion mechanism, a ball-bearing track mechanism, or any other suitable mechanism. Additionally, sliding track  1702  and sliding insert  1804  may individually include bearings (e.g., ball bearings, etc.). 
     It is understood that the description of one of temperature controlled case  100 , temperature controlled case  200 , temperature controlled case  600 , and temperature controlled case  700  similarly applies to the others of temperature controlled case  100 , temperature controlled case  200 , temperature controlled case  600 , and temperature controlled case  700 . It is further understood that the description of one of shelves  110 , shelves  210 , shelves  710 , shelf  1010 , and shelf  1410  similarly applies to the others of shelves  110 , shelves  210 , shelves  710 , shelf  1010 , and shelf  1410 . It is further understood that the description of one of air-curtain discharge  120 , air-curtain discharge  220 , air-curtain discharge  620 , and air-curtain discharge  720 , similarly applies to the others of air-curtain discharge  120 , air-curtain discharge  220 , air-curtain discharge  620 , and air-curtain discharge  720 . It is further understood that the description of one of air-curtain return  130 , air-curtain return  230 , air-curtain return  630 , and air-curtain return  730 , similarly applies to the others of air-curtain return  130 , air-curtain return  230 , air-curtain return  630 , and air-curtain return  730 . It is further understood that the description of one of air straighteners  140 , air straighteners  240 , air straightener  640 , air straightener  1040 , and air straightener  1440  similarly applies to the others of air straighteners  140 , air straighteners  240 , air straightener  640 , air straightener  1040 , and air straightener  1440 . It is further understood that the description of one of support arms  150 , support arms  250 , support arms  650 , support arms  850 , support arm  1050 , and support arm  1450  similarly applies to the others of support arms  150 , support arms  250 , support arms  650 , support arms  850 , support arm  1050 , and support arm  1450 . It is further understood that the description of one of flow guides  160 , flow guides  260 , flow guide  460 , flow guide  660 , flow guides  760 , flow guide  1060 , and flow guide  1460  similarly applies to the others of flow guides  160 , flow guides  260 , flow guide  460 , flow guide  660 , flow guides  760 , flow guide  1060 , and flow guide  1460 . It is further understood that the description of one of air-curtain  170 , air-curtain  270 , air-curtain  670 , and air-curtain  770  similarly applies to the others of air-curtain  170 , air-curtain  270 , air-curtain  670 , and air-curtain  770 . It is further understood that the description of one of pivot  1052  and pivot  1452  similarly applies to the other of pivot  1052  and pivot  1452 . It is further understood that the description of one of stop  1054  and stop  1454  similarly applies to the other of stop  1054  and stop  1454 . 
     While only flow guides  460  have been shown to include luminaires  484 , it is understood that any of flow guides  160 , flow guides  260 , flow guide  660 , flow guides  760 , flow guide  1060 , and flow guide  1460  may similarly incorporate luminaires similar to luminaires  484 . Accordingly, it is understood that the description of luminaire  484 , LEDs  486 , PCB  488 , and all other components of flow guides  460  may similarly apply to similar components of flow guides  160 , flow guides  260 , flow guide  660 , flow guides  760 , flow guide  1060 , and flow guide  1460 . 
     It should be noted that references to “front,” “rear,” “upper,” “top,” “bottom,” “base,” and “lower” in this description are merely used to identify the various elements as they are oriented in the Figures. These terms are not meant to limit the element which they describe, as the various elements may be oriented differently in various temperature controlled cases. 
     Further, for purposes of this disclosure, the term “coupled” means the joining of two members directly or indirectly to one another. Such joining may be stationary in nature or moveable in nature and/or such joining may allow for the flow of fluids, electricity, electrical signals, or other types of signals or communication between the two members. Such joining may be achieved with the two members or the two members and any additional intermediate members being integrally formed as a single unitary body with one another or with the two members or the two members and any additional intermediate members being attached to one another. Such joining may be permanent in nature or alternatively may be removable or releasable in nature. 
     It is important to note that the construction and arrangement of the elements of temperature controlled case and the angled discharge diffuser provided herein are illustrative only. Although only a few exemplary embodiments of the present inventions have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible in these embodiments (e.g., the structure of the diffuser, the discharge angle of the diffuser, the angle of the top and/or bottom portions of the duct that is adjacent to the diffuser, etc.) without materially departing from the novel teachings and advantages of the disclosure. Accordingly, all such modifications are intended to be within the scope of the disclosure.