Abstract:
The present invention provides a system that allows for a single panel of the invention to be easily modified, preferably without the use of tools, to fit on a server rack, where the single panel is so modified as to cover the desired amount of open space on a server rack as a single piece, where the panel is preferably fire-rated, and where the modified panel may be easily installed onto the server rack to as to cover any open space thereon, and prevents the circular flow of warm air output from entering the cooler air input of the servers housed on the server rack.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 12/849,548 filed Aug. 3, 2010, which is a continuation of U.S. patent application Ser. No. 12/229,236 filed Aug. 20, 2008. This application claims the benefit of U.S. Provisional Application No. 60/965,705 filed Aug. 21, 2007, and U.S. Provisional Application No. 60/998,718 filed Oct. 12, 2007. The entire disclosures of the above applications are incorporated herein by reference. 
    
    
     FIELD OF INVENTION 
     This invention relates generally to a panel and system that restricts airflow relative to computer server racks. More specifically, it relates to an assembly of at least one panel on at least one computer server rack, where the panel is scalable, meaning that it may be adjusted to conform to the open and unoccupied facial space on the server rack, so as to aid in preventing the circular flow and re-entry of high temperature air into the air intake of a server, thereby aiding in preventing the overheating of the server. 
     BACKGROUND OF THE INVENTION 
     Computer equipment and data centers have thermal cooling requirements in order to function properly. A high amount of electricity is required for one server to operate, which generates a great deal of heat within the casing of the server. This heat can cause numerous problems for the equipment, including operational failures and physical damage. In order to prevent the server from overheating, internal fans are typically integrated into the server to provide both an intake of cooler air, which may be ambient or conditioned, and an output of hot air. Most commonly, the intake of cooler air occurs at the front of the server, and the output of hot air occurs at the rear of the server. Servers are housed in server racks. When stored in server racks, the servers are all typically aligned such that the cooler air intake for all of the servers is on one side of the server rack, preferably the front of the rack, and the hot air output for all of the servers is on the other side of the server rack, preferably the rear of the rack. This arrangement of one or more servers creates an air flow from the front of the server rack to the rear of the server rack, where the flow can intensify with an increase in the number of servers, due to the BTU output or certain types of high amperage Blade servers producing high amounts of heat. 
     Controlling high temperatures within data centers is very difficult and complex. Yet, keeping computers and data center equipment at the right temperature is critical for the life of the equipment. Such electronic equipment must be maintained in appropriate temperature environments subject to regulated rates of temperature change in order to maintain equipment reliability, abide by electronic equipment warranty provisions and ascertain optimum energy usage. Achieving these requirements is an ever constant and evolving concern for the data center facility manager due to the fact that computer and data processing equipment trend toward increasing the amount of power usage, and thus thermal output and cooling demand. 
     A problem may arise, however, when a server rack is not completely filled with servers. This empty space may permit the air intake of a server to draw the air output from the rear of the server, creating a cycle of air around and to the front of the server. Such a cycling of air does not permit cooler air to be drawn in, but instead draws in warm air that does not aid in the cooling of the server equipment, and instead can cause the server to overheat. To solve this problem, some data centers have installed panels to cover the space that would normally be covered by a face of a server. This covering blocks the circulation of warm air output into the air intake and allows whatever systems are in place within the data center to provide cooler air, such as a Computer Room Air Conditioner (CRAC), to effectively cool the servers. 
     Server rack-mounted equipment are typically measured against an international standard known as the Electronic Industries Alliance (EIA) standard unit, also known as a Rack Unit, or a Rack U (U). Each U is equal to 1.75 inches in height, and the height of server racks is commonly described in the art as being a certain number of U&#39;s high. Server racks may be of any height, however they are typically of a height of between 42 U to 46 U, or greater. 
     However, the current apparatuses for covering openings in server racks to prevent the aforementioned air circulation are inefficient and problematic. Existing panels to cover server rack spaces might have to be installed individually, with one piece to cover each 1 U empty server space. Existing panels to cover server rack spaces do not necessarily permit the use of a single panel to cover the entire unoccupied space on the rack, in that existing panels are manufactured and sold in fixed heights, which can cause the need to affix more than one panel. Panels to cover server rack spaces should be made of fire-rated material, and be able to withstand continuous duty heat associated with this use, as well substantially block air circulation. Existing means for covering server racks spaces may include the use of tools, such as drills, that can damage the material to cover the spaces, as well as be inaccurate and create additional waste or messes. Existing means for affixing the material to the server racks to cover the spaces may include tape, Velcro, magnets and other inefficient means. There is thus a need in the art for a system that can restrict airflow in the front of a server rack which is fire-rated and can be easily installed, modified and removed, and complies with standard industry server rack measurements. 
     SUMMARY OF THE INVENTION 
     The present invention meets the need in the art by providing scalable system that allows for a single panel of the invention to be easily modified, preferably without the use of tools, to fit on a server rack, preferably a server rack that meets EIA Mounting Rail Specification EIA 310, where the single panel is so modified as to cover the desired amount of open space on a server rack, where the panel is fire-rated, and where the modified panel may be easily installed onto the server rack to as to cover the open space thereon, and prevents the circular flow of warm air output from entering the cooler air input of the servers housed on the server rack. It is within the spirit and scope of this invention for multiple panels of the invention to be used on a single server rack, which will depend on the configuration, and hence the open space of a server rack. It is an object of the present invention to provide a system that conforms to and is compatible with EIA standards. 
     The EIA 310 standards, which are well-known by those of ordinary skill in the art, are detailed in part in  FIG. 6 , which is a close up view of a portion of a server rack, showing EIA 310 standard spacing between the holes in the rack, as well as the relative location of the rack unit to the holes on a server rack. Additionally, EIA 310 standards dictate that the height of a single Rack Unit (U or RU) is 1.75 inches. EIA standards further dictate that the horizontal spacing between the two rails in a server rack are 17.75 inches, and that the horizontal spacing between two holes on opposing rails in a rack are 18.3125 inches from the center of one hole to the center of the other hole. 
     The system is adjustable in height, which is achieved by the separation of panel pieces along scored perforations between the pieces. 
     By virtue of its non-destructive mounting feature and the ease with which the panel pieces and aperture scorings are removed and separated, the system can be easily reconfigured as spatial needs change. 
     When installed, the system restricts airflow around servers within the racks. By restricting airflow, the system allows data centers to save electricity and costs associated with electricity usage, as well as additional costs associated with maintaining and replacing servers or server equipment due to overheating, elongating the equipment life. In many circumstances, installation of the system may lower costs associated with the purchase of one or more computer room air conditioning units. By increasing efficiency of such an air conditioning unit, the invention may lower electricity costs. The system may reduce the number of such air conditioning units required to cool a data center, when used in concert with additional air restriction or control means, such as sub-plenum or baffling. The system is removable and repositionable thereby allowing data center managers increased flexibility in arranging equipment within a data center. The system according to the present invention is constructed of material that is more flexible and easier to work with than sheet metal, fiberglass, or other materials currently known in the art. The cost of labor for installation of the system may also be less expensive than the professional installation of substitute materials, due to the ease of installation. These and other advantages and features of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an embodiment of a full panel of the present invention. 
         FIG. 2  is a close up view of an embodiment of three joined panel pieces, with a center break down the middle of the sections to show both ends of the sections on a single drawing. 
         FIG. 3  is another embodiment of a full panel of the present invention. 
         FIG. 4  is a close up view of another embodiment of three joined panel pieces, with a center break down the middle of the sections to show both ends of the sections on a single drawing. 
         FIG. 5  is a close up view of yet another embodiment of three joined panel pieces, with a center break down the middle of the sections to show both ends of the sections on a single drawing. 
         FIG. 6  is a close up view of a portion of a server rack, showing EIA 310 standard spacing between the holes in the rack, as well as the relative location of the rack unit to the holes on a server rack. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention is an EIA rack enclosure blanking panel system comprised of lightweight and flexible material that may be easily modified and easily installed upon computer server racks without destructive attachment to the racks, or any additional equipment. After installation, blanking panel pieces of the system may be easily removed from the server rack. Upon removal from the server rack, the pieces may be further separated from each other and re-installed upon the server racks. In the preferred embodiment the blanking panel pieces are scored to allow for break-apart sizing and shaping. Due to their break-apart or tear-away construct the desired configuration of blanking panel pieces may be achieved with or without tools. 
     In an embodiment, the panel is between about 18.75 inches to about 19.50 inches wide. In a preferred embodiment, the panel is between about 19.00 inches to about 19.25 inches wide. In a particularly preferred embodiment, the panel is about 19.00 inches wide, more preferably exactly 19.00 inches wide. In another particularly preferred embodiment, the panel is about 19.25 inches wide, more preferably exactly 19.25 inches wide. 
     In a preferred embodiment, the panel is several U&#39;s in height, more preferably 27 U&#39;s in height or greater. In a particularly preferred embodiment, the panel is scored horizontally such that the panel is divided into equal, substantially identical separable pieces, each piece being about one U in height. In a preferred embodiment, each piece is exactly one U in height. In another embodiment of the present invention, each piece on a panel is exactly two U in height. 
     In another embodiment of the present invention, each piece on a panel is uniform in height throughout the panel, and the height of each piece is n U in height, where n is an integer. As an example of this embodiment, in a 27 U panel, there may be nine pieces, each piece being 3 U high. As another example of this embodiment, in a 27 U panel, there may be 27 pieces, each being 1 U high. 
     In another embodiment of the present invention, the pieces on a single panel are not uniform in height throughout the panel, but rather are of a variety of heights, where the height of any individual piece may be represented as y U high, where y is an integer. As an example of this embodiment, in a 27 U panel, there may be three pieces that are each 4 U high, three pieces that are each 3 U high, and three pieces that are each 2 U high. As another example of this embodiment, in a 27 U panel, there may be nine pieces that are each 2 U high, and nine pieces that are each 1 U high. 
     In another embodiment of the present invention, the panel comprises a single piece that is z U high, where z is an integer. As an example of this embodiment, in a 27 U panel, there is one piece that is 27 U high. 
     In an embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on both of the opposite horizontal ends of each piece of the panel, an aperture scoring is present. In another embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, three aperture scorings are present. In a particularly preferred embodiment, the aperture scorings are present such that the panel of the present invention substantially corresponds with at least some of the rail holes of a server rack that substantially complies with EIA mounting hole locations. 
     In an embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, at least one aperture scoring, in the shape of a circle, is present. 
     In an embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, at least one aperture scoring, in the shape of an ellipse, is present. 
     In an embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, at least one aperture scoring, in the shape of a rectangle, is present. 
     In an embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, at least one aperture scoring, in the shape of a ‘T’ shape, is present, where a ‘T shape’ refers to a shape that comprises two substantially perpendicular line segments of some width greater than zero, where one line segment terminates at the midpoint of the other line segment. 
     In an embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, at least one aperture scoring, in the shape of a half-racetrack, or a ‘U’ shape, is present. 
     In a preferred embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, at least one aperture scoring, in a rounded ‘T’ shape, is present. 
     In a preferred embodiment, the panel is further scored, in addition to the scoring between the pieces, such that, on the opposite horizontal ends of each piece of the panel, at least one aperture scoring, in a rounded rectangle shape, is present. 
     In a more preferred embodiment, where only one aperture scoring is present on each opposite horizontal end of each piece, the aperture scoring is uniform throughout the panel, and occurs halfway up each piece vertically. 
     In a preferred embodiment, where a piece n U high, that piece has 2n aperture scorings, where n is an integer, and the piece has an even amount of aperture scorings on each opposite end of the piece, and the aperture scorings are evenly spaced through the opposite horizontal ends of the piece. 
     In an embodiment, where a piece is n U high, that piece has four aperture scorings, located substantially near the four corners of the piece. 
     The terms “scored” or “scoring” as used in this patent application are defined to include marks or lines created upon a surface by way of scoring, press-cutting, perforating, etching, laser cutting, knife cutting, or any other technique that results in the incomplete cutting or removal of material. 
     It is an embodiment of this invention, and it is understood by those of ordinary skill in the art that where the terms “scored” or “scoring” as used in this patent application in reference to the apertures, those terms also embrace as equivalents any scoring, press-cutting, perforating, etching, laser cutting, knife cutting, or any other technique that results in the complete cutting or removal of material. 
     In the preferred embodiment, the aperture scoring areas of the panel pieces constitute “pop-out sections.” These pop-out sections may be removed by hand from the panel pieces by application of pressure applied upon the area of the panel pieces within the aperture scoring outline. In the preferred embodiment, the pressure necessary to remove the pop-out section is finger pressure. Alternatively, the pop-out section can be pressed out with a tool or can be cut out by drawing a knife-edge or sharp tool along the scored outline. Once the pop-out section is removed, a fastener-accepting aperture results in the location of the former pop-out section. 
     In a preferred embodiment, the panel should be of a relatively thin material. In a preferred embodiment, the panel should be of a relatively thin, fire-retardant material. In a preferred embodiment, the panel should be thin enough that it may be readily attached to a server panel through the use of mounting equipment known by those of ordinary skill in the art, such as brackets, screws, pins, pegs, bolts, hooks and other similar equipment. In a preferred embodiment, the panel may be substantially comprised of thermoplastic material, such as Acrylonitrile butadiene styrene (ABS). In another preferred embodiment, the panel may be substantially comprised of Chlorinated Polyvinyl Chloride or Chlorinated Polyvinylidine Chloride. In another preferred embodiment, the panel may be substantially comprised of Polyphenylene oxide-styrene (POS). In another preferred embodiment, the panel may be substantially comprised of plexiglass. In another preferred embodiment, the panel may be substantially comprised of high-density polyethylene (HDPE). In another preferred embodiment, the panel may be substantially comprised of any polypropylene compound. 
     Referring to  FIG. 1 , there is shown generally an embodiment of a full panel  10  of the present invention, this particular panel being about 27 U in height  14 . Each piece  16  is uniform in height and width  12 , and each piece has two half-racetrack shaped scoring apertures  18  on the opposite ends of the piece  16 . 
     Referring to  FIG. 2 , there is shown a close up view of an embodiment of three joined panel pieces  16 , where a pair of jagged lines  20  represents a continuation of the pieces, which has been done to fit the figure onto one page for close inspection. Each piece is uniform in height  22  and width  12 , and each piece  16  has two half-racetrack shaped scoring apertures  18  on the opposite ends of the piece  16 . Each aperture  18  is located within the center of the edge of the piece on which the aperture resides, such that the measurements  30  from the each of the edges of the apertures  18  to the scored edges of the piece on which it resides are equidistant. Similarly, the center of the aperture  18  is aligned such that it is halfway down the edge of the piece  24 . Each aperture is of a uniform length  28  and height  32 , and in a uniform location throughout all of the pieces  16  of the panel. The apertures  18  on each piece  16  are equidistant  26  from each other throughout the panel. Each piece  16  has been scored  34  so as to permit ready separation from adjacent pieces  16 . Each aperture  18  has been scored  36  so as to permit ready separation from the piece  16  on which it resides. 
     Referring to  FIG. 3 , there is shown generally another embodiment of a full panel  10  of the present invention, this particular panel being about 27 U in height  14 . Each piece  16  is uniform in height and width  12 , and each piece has two rounded T shaped scoring apertures  38  on the opposite ends of the piece  16 . 
     Referring to  FIG. 4 , there is shown a close up view of an embodiment of three joined panel pieces  16 , where a pair of jagged lines  20  represents a continuation of the pieces, which has been done to fit the figure onto one page for close inspection. Each piece is uniform in height  22  and width  12 , and each piece  16  has two rounded T shaped scoring apertures  38  on the opposite ends of the piece  16 . Each aperture  38  is located within the center of the edge of the piece on which the aperture resides, such that the measurements  30  from the each of the edges of the apertures  38  to the scored edges of the piece on which it resides are equidistant. Similarly, the center of the aperture  38  is aligned such that it is halfway down the edge of the piece  24 . Each aperture is of a uniform length  28 . Each aperture is of a uniform height, both in the narrowest height  40  and in the widest height  42 . Each aperture is in a uniform location throughout all of the pieces  16  of the panel. Each aperture is of a uniform depth  44  from the edge of the piece to the widest region of the aperture. Each aperture is of a uniform depth  46  throughout the widest region of the aperture. The apertures  38  on each piece  16  are equidistant  26  from each other throughout the panel. Each piece  16  has been scored  34  so as to permit ready separation from adjacent pieces  16 . Each aperture  38  has been scored  36  so as to permit ready separation from the piece  16  on which it resides. In this particular embodiment, the scoring  34  between the pieces results in nicks  48  that serve to hold the pieces  16  together until perforation. The spacing  50  between the nicks  48  is uniform in length throughout the perforations between the pieces. 
     Referring to  FIG. 5 , there is shown a close up view of yet another embodiment of three joined panel pieces  16 , where a pair of jagged lines  20  represents a continuation of the pieces, which has been done to fit the figure onto one page for close inspection. Each piece is uniform in height  22  and width  12 , and each piece  16  has two rounded rectangle shaped scoring apertures  52  on the opposite ends of the piece  16 . Each aperture  52  is located within the center of the edge of the piece on which the aperture resides, such that the measurements  30  from the each of the edges of the apertures  52  to the scored edges of the piece on which it resides are equidistant. Similarly, the center of the aperture  52  is aligned such that it is halfway down the edge of the piece  24 . Each aperture is in a uniform location throughout all of the pieces  16  of the panel. Each aperture is located at a uniform depth  54  from the edge of the piece to the outermost edge of the aperture. Each aperture is located at a uniform depth  62  from the edge of the piece to the innermost edge of the aperture. Each aperture is of a uniform height  56 . Each aperture is of a uniform width  58 . The apertures  52  on each piece  16  are equidistant  26  from each other throughout the panel. The centers of the apertures  52  on each piece  16  are equidistant  60  from each other throughout the panel. Each piece  16  has been scored  34  so as to permit ready separation from adjacent pieces  16 . Each aperture  52  has been scored  36  so as to permit ready separation from the piece  16  on which it resides. In this particular embodiment, the scoring  34  between the pieces results in nicks  48  that serve to hold the pieces  16  together until perforation. The spacing  50  between the nicks  48  is uniform in length throughout the perforations between the pieces. 
     In each embodiment herein, where scoring apertures are present, regardless of the width of the panel piece, the scoring apertures will substantially align with at least two opposing rack holes of an EIA compliant frame. 
     In a preferred embodiment, each panel piece has been scored on the ends of the panel piece, such that a half-racetrack shaped scoring aperture is present on each end, each aperture located substantially in the center of the respective vertical edges of the piece, each aperture being between about 0.250 to about 0.375 inches high, and being located between about 0.625 to about 0.875 inches from the vertical edge of the piece on both sides of the aperture, each aperture being about 0.6875 inches deep, measured horizontally from the edge of the piece to the furthest inside edge of the aperture. 
     In another preferred embodiment, each panel piece has been scored on the ends of the panel piece, such that a rounded T shaped scoring aperture is present on each end, each aperture located substantially in the center of the respective vertical edges of the piece, each aperture being between about 0.200 to about 0.375 inches high at the narrowest region and being between about 0.300 to about 0.500 inches high at the highest region. In this preferred embodiment, the apertures are located between about 0.300 to about 0.400 inches from the edge of the end of the piece to the innermost scoring of the aperture. 
     In yet another preferred embodiment, each panel piece has been scored on the ends of the panel piece, such that a rounded rectangle shaped scoring aperture is present on each end, each aperture located substantially in the center of the respective vertical edges of the piece, each aperture being between about 0.350 to about 0.500 inches high and being between about 0.200 to about 0.375 inches wide. In this preferred embodiment, the apertures are located between about 0.725 to about 0.775 inches from the vertical edge of the piece on both sides of the aperture. In this preferred embodiment, each aperture is about 0.6875 inches deep, measured horizontally from the edge of the piece to the furthest inside edge of the aperture. 
     In a preferred embodiment, the panel pieces have been scored such that between the scored pieces results are nicks that serve to hold the pieces together until perforation. The spacing between the nicks is uniform in length throughout the perforations between the pieces, and is preferably between about 0.200 to about 1.000 inches, more preferably between about 0.250 to about 0.500 inches. In this preferred embodiment, the nicks are of a uniform length throughout the perforations between the pieces, and are preferably between about 0.15625 to about 0.250 inches in length, and are preferably about 0.03125 inches in length. 
     In a preferred embodiment, each panel piece has been scored three times on each of the ends of the panel piece, such that a series of three scoring apertures are present on each end, each aperture located equidistant from the two most adjacent scorings, whether those scorings are for an adjacent aperture or a scoring between two panel pieces, or the edge of the panel. 
     In a preferred embodiment, each panel piece has been scored three times on each of the ends of the panel piece, such that a series of three half-racetrack shaped scoring apertures are present on each end, each aperture located equidistant from the two most adjacent scorings, whether those scorings are for an adjacent aperture or a scoring between two panel pieces, or the edge of the panel. In this preferred embodiment, each aperture is between about 0.250 to about 0.375 inches high, and is about 0.6875 inches deep, measured horizontally from the edge of the piece to the furthest inside edge of the aperture. 
     In a particularly preferred embodiment of the present invention, the system comprises a 27 U panel, where the panel is about 19.25 inches wide, and is about 47.25 inches high. In this particularly preferred embodiment, the panel has been scored such that each piece of the panel may be readily separated from the pieces directly adjacent to each piece, and has been scored so as to substantially prevent air flow through the scoring. In this particularly preferred embodiment, each panel piece has been additionally scored on the ends of the panel piece, such that a half-racetrack shaped scoring aperture is present on each end, each aperture located substantially in the center of the respective vertical edges of the piece, each aperture being about 0.250 inches high, and being located about 0.875 inches from the vertical edge of the piece on both sides of the aperture, each aperture being about 0.6875 inches deep, measured horizontally from the edge of the piece to the furthest inside edge of the aperture. In this particularly preferred embodiment, the panel has been scored such that each half-racetrack shaped scoring aperture may be readily separated from the pieces on which it resides, and has been scored so as to substantially prevent air flow through the scoring. 
     As used herein, and as would be understood by those of ordinary skill in the art, the term “rounded rectangle” refers to a shape that is substantially rectangular, which includes a shape that is square, where the four corners have been rounded into equal arcical segments of ninety degrees. 
     As used herein, and as would be understood by those of ordinary skill in the art, the term “rounded T” refers to a shape that comprises two substantially perpendicular line segments of some width greater than zero, where one line segment terminates at the midpoint of the other line segment, and where at least two corners have been rounded into equal arcical segments of ninety degrees. In an embodiment of the term “rounded T”, all of the corners have been rounded into equal arcical segments of ninety degrees. In an embodiment of the term “rounded T”, the two line segments are of about equal length. 
     The present invention additionally includes a kit, where the kit comprises at least one server rack blanking panel of the present invention and additionally mounting equipment known by those of ordinary skill in the art, such as brackets, screws, pins, pegs, bolts, hooks and other similar equipment. The mounting equipment may be readily attached to the server rack blanking panel or pre-attached thereto, and may be attached either permanently or removably. 
     As can be seen by the embodiments and drawings disclosed herein, the present invention permits the easy and flexible application of the invention to empty server rack space. For example, on a typical server rack that is 46 U in height, where the top ten U are empty, and where computer equipment, including potentially servers, occupy the remainder of the rack, a section of the panel may be separated such that a sub-panel of ten panel pieces is removed from the remainder of the panel along the desired scored perforations. In this example, where each panel piece has one half-racetrack shaped scoring aperture on each end, these scoring apertures on the two opposite end pieces of this sub-panel may be removed along the scored perforations of those apertures, and potentially additional apertures may be so removed as desired. In this example, the sub-panel may then be affixed to the open space of the server rack, either on the front or the back of the rack, so as to prevent air flow from the rear of the equipment on the server rack from migrating to the front of the equipment on the server rack through the server rack. In this example, the sub-panel may be so affixed in a manner known by those skilled in the art, including those disclosed herein. 
     While specific embodiments have been shown and described, many variations are possible. The particular shape of the segments and scored lines and markings, scoring depths and aperture outlines including all horizontal and vertical orientations, dimensions and thicknesses may be changed as desired to suit the particular server rack with which the invention is used. The material and its configuration and number of segments may vary although preferred embodiments are shown and described. The terms, descriptions and figures used herein are set forth by way of illustration only and are not meant as limitations. Those of ordinary skill in the art will recognize that many variations are possible within the scope of the invention, which is intended to be defined by the disclosure herein and their equivalents, in which all terms are meant in their broadest reasonable sense unless otherwise indicated.