Patent Publication Number: US-7908813-B2

Title: Ceiling panel

Description:
TECHNICAL FIELD 
     This invention relates generally to suspended ceiling systems and, more particularly, to panels used in a suspended ceiling system. 
     BACKGROUND 
     Suspended ceiling systems are widely used in a variety of applications, such as in commercial and residential buildings. Grid-type suspension ceilings cover the plenum area, while still allowing access to the plenum area, which typically contains components of the building&#39;s wiring, heating, venting, air conditioning, plumbing, among other mechanical components. A grid of spaced runners and cross-runners are frequently used to position and support the panels. The runners and cross-runners are generally suspended from the ceiling using wires, rods, or other suspension runners, and are arranged and sized according to the shape and size of the panels being supported therein. 
     The ceiling tile or panel is commonly supported in the grid by laying the perimeter of the panel on the panel-support flanges of the runners. This results in an exposed suspension grid system, which must be, among other requirements, finished and otherwise made aesthetically pleasing. Thus, by decreasing the exposed portion of the grid, manufacturing costs may be reduced by avoiding the finishing requirements. In addition, if grid exposure is decreased by positioning a portion of the panel to cover the grid, as opposed to using additional structures such as framing or molding, the desired monolithic appearance of a ceiling grid may be achieved. 
     While it is often preferable that at least a portion of the grid runners be concealed to provide a more aesthetically pleasing ceiling, installation and removal of the ceiling panels within the grid can be complicated by the features used to conceal the grid. For example, additional trim pieces can be added to the grid to provide an aesthetically pleasing transition from panel to panel. This, however, adds additional costs by way of adding more components and installation time. In addition, the trim pieces may interfere with easy installation of the panel. 
     Another known installation and removal method is a lift-and-shift installation, wherein one edge of the ceiling panel is lifted and mounted onto a grid runner and then the edge is shifted toward the first grid runner to allow the opposite edge of the panel, including any concealment features, to give clearance so that the opposite edge can be mounted onto a second grid runner and then shifted and centered. This design enables the panel to include structure that extends beyond the grid to conceal the grid. The lift-and-shift installation reduces the amount of space needed above the grid and makes installation faster since the installer can more easily raise and manipulate the ceiling panel into position without raising the panel through and above the grid. 
     As with most construction, quicker and easier installation saves both time and money. Thus, the ceiling panels and the method of installation should be efficient, economical, and effective. Further, since access is required to the plenum area above the suspension ceiling, the panels should be readily removable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a suspended ceiling system as configured in accordance with various embodiments of the invention; 
         FIG. 2  is a perspective view of a first embodiment of a ceiling panel embodying features of the present invention; 
         FIG. 3  is a perspective view of the ceiling panel of  FIG. 2  as suspended from grid runners; 
         FIG. 4  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 3  as taken along line  4 - 4  thereof, with an adjacent ceiling panel suspended from the grid runner; 
         FIG. 5  is a cross-sectional view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 4 , showing the installation or removal of one of the ceiling panels; 
         FIG. 6  is a perspective view of a second embodiment of a ceiling panel embodying features of the present invention; 
         FIG. 7  is a perspective view of the ceiling panel of  FIG. 6  as suspended from grid runners; 
         FIG. 8  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 7  as taken along line  8 - 8  thereof, with an adjacent ceiling panel suspended from the grid runner; 
         FIG. 9  is a cross-sectional view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 8 , showing the installation or removal of one of the ceiling panels; 
         FIG. 10  is a perspective view of a third embodiment of a ceiling panel embodying features of the present invention; 
         FIG. 11  is a perspective view of the ceiling panel of  FIG. 10  as suspended from grid runners; 
         FIG. 12  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 11  as taken along line  12 - 12  thereof, with an adjacent ceiling panel suspended from the grid runner; 
         FIG. 13  is a cross-sectional view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 12 , showing the installation or removal of one of the ceiling panels; 
         FIG. 14  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 12 , showing an additional view of the installation or removal of one of the ceiling panels; 
         FIG. 15  is a perspective view of a fourth embodiment of a ceiling panel embodying features of the present invention; 
         FIG. 16  is an exploded perspective view showing the frame and facing material of the ceiling panel of  FIG. 15 ; 
         FIG. 17  is a perspective view of the frame of  FIG. 16 , with the frame in an unassembled configuration; 
         FIG. 18  is a fragmentary perspective view of a corner of the ceiling panel of  FIG. 15 ; 
         FIG. 19  is a perspective view of the ceiling panel of  FIG. 15  as suspended from grid runners; 
         FIG. 20  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 19  as taken along line  20 - 20  thereof, with an adjacent ceiling panel suspended from the grid runner; 
         FIG. 21  is a cross-sectional view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 20 ; 
         FIG. 22  is a cross-sectional view of the suspended ceiling panels and grid runners of  FIG. 21  showing the installation or removal of one of the ceiling panels; 
         FIG. 23  is a perspective view of a fifth embodiment of a ceiling panel embodying features of the present invention 
         FIG. 24  is an exploded perspective view showing the frame and facing material of the ceiling panel of  FIG. 23 ; 
         FIG. 25  is a perspective view of the frame of  FIG. 24 , with the frame in an unassembled configuration; 
         FIG. 26  is a fragmentary top view of a corner of the ceiling panel of  FIG. 23 ; 
         FIG. 27  is a fragmentary perspective view of a corner of the ceiling panel of  FIG. 23 ; 
         FIG. 28  is a perspective view of the ceiling panel of  FIG. 23  as suspended from grid runners; 
         FIG. 29  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 28  as taken along line  29 - 29  thereof, with an adjacent ceiling panel suspended from the grid runner; 
         FIG. 30  is a side view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 30 ; 
         FIG. 31  is a side view of the suspended ceiling panels and grid runners of  FIG. 30  showing a first step in the removal of one of the ceiling panels; 
         FIG. 32  is a side view of the suspended ceiling panels and grid runners of  FIG. 30  showing a second step in the removal of one of the ceiling panels; 
         FIG. 33  is a perspective view of a sixth embodiment of a ceiling panel embodying features of the present invention; 
         FIG. 34  is a perspective view of the ceiling panel of  FIG. 33  as suspended from grid runners; 
         FIG. 35  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 34 , with an adjacent ceiling panel suspended from the grid runner; 
         FIG. 36  is a cross-sectional view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 35 , showing the installation or removal of one of the ceiling panels; 
         FIG. 37  is a perspective view of a seventh embodiment of a ceiling panel embodying features of the present invention; 
         FIG. 38  is a perspective view of the ceiling panel of  FIG. 37  as suspended from grid runners; 
         FIG. 39  is a cross-sectional view of the ceiling panel and grid runner of  FIG. 38 , with an adjacent ceiling panel suspended from the grid runner; 
         FIG. 40  is a cross-sectional view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 39 , showing the installation or removal of one of the ceiling panels; 
         FIG. 41  is a perspective view of an eighth embodiment of a ceiling panel embodying features of the present invention; 
         FIG. 42  is a fragmentary perspective view of a corner of the ceiling panel of  FIG. 41 ; 
         FIG. 43  is a cross-sectional view of the ceiling panel of  FIG. 41  as suspended from a grid runner and with an adjacent ceiling panel also suspended from the grid runner; and 
         FIG. 44  is a cross-sectional view of a plurality of the suspended ceiling panels and grid runners shown in  FIG. 43 , showing the installation or removal of one of the ceiling panels. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Generally, in one form, a ceiling panel is provided for use in a grid-type suspended ceiling, wherein the grid includes a plurality of spaced grid runners. The ceiling panel comprises a tile base with perimeter segments and perimeter profiles along at least a portion of at least two of the perimeter segments. Each profile is supportable by the grid runners during suspension. A facing material is secured across the perimeter segments, and extends beyond the perimeter profiles in order to at least partially conceal two of the grid runners when the tile is suspended from the two grid runners and viewed from below. 
     More specifically, and with reference to  FIG. 1 , a suspended ceiling is depicted generally at  10 , and includes a plurality of main tee grid runners  12 ,  14 ,  16  and a plurality of cross tee grid runners  18 ,  20  connected to the main tee grid runners  12 ,  14 ,  16  to form a grid structure  22 . The main tee grid runners  12 ,  14 ,  16 , are typically hung from a ceiling structure (not shown), such as, for example, joists or a slab ceiling. The main tee grid runners  12 ,  14 ,  16  are hung from the ceiling structure by suspension members (not shown), such as wires or rods. 
     The main tee grid runners  12 ,  14 ,  16  are generally available in standard lengths, such as 12 feet (3.66 meters), and multiple main tee grid runners may be spliced together to run the length of a room. The main tee grid runners  12 ,  14 ,  16  and cross tee grid runners  18 ,  20  are configured and positioned according to the size and shape of the panel to be positioned within the grid. As shown in  FIG. 1 , the panels  24  are generally rectangular in shape and, therefore, the main tee grid runners  12 ,  14 ,  16  are generally oriented parallel and spaced apart from each other. The cross tee grid runners  18 ,  20  are also generally oriented parallel and spaced apart from each other, while extending generally perpendicular to the main tee grid runners  12 ,  14 ,  16  to form the grid  22 . Once the grid  22  is formed, the ceiling panels  24 , such as those described below, are placed into spaces formed by the grid  22  and suspended by the grid structure  22 . The ceiling panels  24  are generally suspended in a horizontal plane, although other configurations are possible. It should be noted that the grid  22  of  FIG. 1 , including the configuration and orientation of the main tee grid runners  12 ,  14 ,  16  and cross tee grid runners  18 ,  20 , is merely illustrative and other configurations are contemplated to accommodate ceiling panels of different shapes and sizes. 
     With reference to  FIG. 2 , there is illustrated a perspective view of a first embodiment of a ceiling panel  100  to be used in the grid structure  22  of  FIG. 1 . In this embodiment, the ceiling panel  100  comprises a core tile or tile base  102  and a lightweight facing material  104  secured across a lower face  126  (shown in  FIG. 4 ) of the tile base  102 . Both the tile base  102  and the facing material  104  are shown as being generally rectangular in shape, although other shapes are contemplated. The facing material  104  generally functions to provide an aesthetically pleasing and monolithic ceiling appearance. The tile base  102  provides the suspension structure for the ceiling panel  100  such that the ceiling panel  100  engages with and is supported by the grid  22 . The tile base  102  can have a variety of materials known in the art, such as, for example, fiberglass, mineral fiber, plastic, wood, or metal. The tile base  102  is preferably lightweight in order to minimize the overall weight of the ceiling panel  100 . 
     As illustrated in  FIG. 4 , each main tee  12 ,  14 ,  16  has a generally identical configuration, with such configuration being generally known in the art. The cross-section of each main tee  12 ,  14 ,  16  includes an upper bulb  30 , a web  32  extending from the bulb  30 , and a support flange  34 , having laterally extending sides  36  and  38 . The ceiling panels  100  are generally supported or engaged with the sides  36 ,  38  of the support flange  34  to maintain the ceiling panels  100  in a suspended position within the grid  22 .  FIGS. 3 and 4  show the installed condition of the ceiling panel  100 . 
     As seen in  FIGS. 2-5 , the tile base  102  has perimeter segments  106 ,  108 ,  110 , and  112  and a stepped perimeter profile  128  along at least two opposing perimeter segments or edge regions  106 ,  108 . In this embodiment, the stepped profile  128  is comprised of a horizontal support kerf  114  formed approximately halfway down edge regions  106 ,  108  of the tile base  102  and is defined by an upper horizontal surface  130  and an end vertical surface  132 . A positioning kerf  116  is formed below the support kerf  114  along the edge regions  106 ,  108 , with the positioning kerf  116  defined by an upper horizontal surface  134  and an end vertical surface  136  and the positioning kerf  116  extending horizontally deeper than the support kerf  114  to complete the stepped profile  128 . The support kerf  114  generally functions to provide a suspension surface for the ceiling panel  100 , with the support kerf  114  being supported by the flange  34  of the main tee grid runner  12  during suspension of the ceiling panel  100 , as shown in  FIGS. 3 and 4 . The support kerf  114  also assists in accurately positioning the ceiling panel  100  on the grid flange  34 . As shown, the support kerf  114  has a height slightly greater than the height of the flange  34  of the main the grid runner  12  and extends deep enough to allow the support kerf  114  to be supported with stability by the flange  34 . The positioning kerf  116  allows for the lift and shift installation and/or removal of the ceiling panel  100  from the grid  22 . The height of the positioning kerf  116  is preferably greater than the thickness of the facing material  104  to provide for sufficient clearance for the installation and removal of the ceiling panel  100 . In other words, the facing material  104  has a thickness less than a distance between perimeter profile  128  and the facing material  104  so that the facing material  104  from an adjacent ceiling panel can fit within this space as described below. The tile base  102  should be generally thick enough to accommodate the stepped profile  128 . Another pair of opposing perimeter segments or side regions  110 ,  112  of the ceiling panel  100  are shown on  FIG. 2  as vertically extending linear walls, although other profile options may be used. From the foregoing and with reference to  FIGS. 2-5 , it will be understood that the facing material  104  is secured to the lower face of the base  102 , the positioning kerf  116  has an upper surface and a lower surface whereby the facing material forms the lower surface of the positioning kerf and the facing material is cantilevered beyond each of the four sides of the base. 
     The facing material  104  is preferably a thin, lightweight scrim. The lightweight nature of the facing material  104  allows for alternate suspension and installation methods. The facing material  104  may be any of a variety of materials known in the art, such as, for example, woven or non-woven material, wood, fiber, plastic, polymer, metal, foam, foil, film, ceramic, glass, or any combination thereof. In addition, the facing material  104  properties may be varied by treating the material, such as, for example, by coating, forming, thermosetting, or layering the material to enhance or modify structural or performance capabilities or appearance. The material and/or treatment of the material may be selected based on any of a variety of targeted properties for the facing material  104 , such as, for example, the weight, rigidity, structural integrity, noise-reduction coefficient characteristics, sound transmission coefficient characteristics, fire resistance, acoustical performance, aesthetics, humidity and moisture resistance, and microbial resistance, just to name a few. The facing material  104  may be rigid, semi-rigid, or flexible, depending on the properties and thickness of the material that is used. For the present embodiment, the facing material is preferably thick enough to provide some structure and rigidity to the facing material. By one optional approach, the material of the tile base  102  and the facing material  104  may be selected and coordinated to acquire desired aesthetics and acoustical properties. 
     The facing material  104  may be secured to the tile base  102  by any method known in the art, such as, for example, by adhering or laminating the layers together or by a mechanical connection between the layers. The facing material  104  is sized to extend beyond an edge region of the tile base  102 . As shown in  FIGS. 2-5 , the facing material  104  is secured across the perimeter segments  106 - 112 , and preferably extends beyond the tile base  102  around the entire perimeter of the core tile  104 . As a result, the facing material  104  conceals the stepped profile  128  of the opposing edge regions  106 ,  108  of the tile base  102  during suspension when viewed from below, thereby at least partially concealing two of the grid runners and the ceiling panel&#39;s point of engagement and support with the grid  22 . 
     In this embodiment, the facing material  104  extends beyond the edge region of the core tile to at least partially conceal the grid during suspension when viewed from below. Referring to  FIG. 3 , when the support kerf  114  on opposing sides of the tile base  102  are supported by adjacent parallel main tee grid runners  12 ,  14  such that the ceiling panel  100  is suspended, the facing material  104  extends to conceal the stepped profile  128  and then extends beyond the edge region of the tile base  102  and below the flange  34  such that at least a portion of the grid  22  is concealed. It also should be appreciated that the facing material  104  extends beyond opposing side regions  110 ,  112  of the tile base  102  to at least partially conceal the cross tee grid runners extending between the main tee grid runners. 
     Referring now to  FIG. 4 , adjacent ceiling panels are shown being supported by a common main tee grid runner  12 , with the support kerf  114  of edge region  106  of panel  100 A being supported by side  36  of the flange  34  and the support kerf  114  of edge region  108  of panel  100 B being supported by the other side  38  of the flange  34 . In this embodiment, when adjacent panels  100 A and  100 B are suspended from each side  36 ,  38  of the grid flange  34 , the facing material  104  of each ceiling panel  100 A,  100 B extends beyond the edge regions  106 ,  108  of the respective tile bases  102  to at least partially conceal the respective sides  36 ,  38  of the grid flange  34 . In addition, the facing material  104  of each ceiling panel extends beyond the side regions  110 ,  112  of the respective tile bases  102  to at least partially conceal the cross tee grid runners. Preferably, a portion of the facing material  104  of one ceiling panel  100 A contacts a portion of the facing material  104  of the adjacent ceiling panel  100 B to conceal a portion of one of the grid runners  12 . More specifically, the outer edge regions  120  of the adjacent facing materials  104  of ceiling panels  100 A and  100 B extend to touch and seat flush against each other such that the main tee grid runners and cross tee grid runners are fully concealed to provide a monolithic suspended ceiling appearance. As can be seen, the length of the facing material  104  beyond the tile base  102  edge regions  106 ,  108  and side regions  110 ,  112  is generally a function of the depth of the support kerf  114 , the width of the flange  34  of the main tee grid runner  12 , and the size of the portion of the flange  34  that is to be concealed. 
       FIG. 5  illustrates a ceiling panel  100  being installed and/or removed from a suspended position within the grid  22  using a lift-and-shift motion. The removal of the ceiling panel  100  will be described, with the installation of the ceiling panel  100  being accomplished by the same series of steps being performed in reverse order and in the reverse direction.  FIG. 5  shows adjacent parallel main tee grid runners  12 ,  14  with a series of three adjacent ceiling panels  100 A,  100 B, and  100 C. Ceiling panels  100 A and  100 B share common main tee grid runner  14 , and ceiling panels  100 B and  100 C share common main tee grid runner  12 . In this illustration, ceiling panel  100 B is being removed. As the ceiling panels are symmetrical in that there is the stepped profile  128  along opposing edge regions  106 ,  108 , it is understood that the installation and/or removal may be performed using the features along either edge region  106 ,  108  of the ceiling panel  100 . 
     To begin removal, the ceiling panel  100 B of this embodiment is lifted vertically until the facing material  104  along sides  106 ,  108  is generally adjacent the flanges  34  of main tee grid runners  12 ,  14  and positioned above the facing material  104  of adjacent ceiling panels  100 A and  100 C. The ceiling panel  100 B is then shifted to the right toward ceiling panel  100 C (although the removal may also be completed by shifting the ceiling panel  100 B to the left toward ceiling panel  100 A). When the ceiling panel  100 B is shifted to the right, the facing material  104  on side  106  of the ceiling panel  100 B is inserted in the space between flange  34  of main tee grid runner  12  and the facing material of ceiling panel  100 C. In addition, side  36  of the main tee grid runner  12  is positioned within the positioning kerf  116  of side  106  of the ceiling panel  100 B. As the ceiling panel  100 B is further shifted to the right, the tile base  102  shifts clear of the flange  34  of main tee grid runner  14  and is able to drop down. As the side  108  of the ceiling panel  100 B continues to drop, the facing material  104  of side  106  is removed from the space between the flange  34  of main tee grid runner  12  and the facing material  104  of ceiling panel  100 C and also is free to drop down such that panel  100 B can be removed. 
     Referring now to  FIGS. 6-9 , there is illustrated a second embodiment of a ceiling panel  200  to be used in the grid structure  22  of  FIG. 1 . As with ceiling panel  100 , the ceiling panel  200  of this embodiment comprises a core tile or tile base  202  and a facing material  204  secured across a lower face  226  of the tile base  202  as indicated on  FIG. 8 . The tile base  202  has generally the same configuration as the tile base  102  of ceiling panel  100 , including a stepped perimeter profile along a pair of opposing edge regions  206 ,  208  and vertically extending linear walls along a pair of opposing side regions  210 ,  212 . The stepped perimeter profile  228  is comprised of a horizontal support kerf  214  and a horizontal positioning kerf  216  positioned below the support kerf  214 , with each kerf  214 ,  216  configured similarly to the kerfs  114 ,  116  of ceiling panel  100 . 
     The facing material  204  of the ceiling panel  200  has a first pair of opposing outer edge regions  220  adjacent the stepped profile  228  edge regions  206 ,  208  of the tile base  202  and a second pair of opposing outer edge regions  222  adjacent the side regions  210 ,  212  of the core tile. As with the facing material  104  of the ceiling panel  100 , the facing material  204  is sized to extend beyond an edge region of the lower face  226  of the tile base  202 . The facing material  204  preferably extends beyond the tile base  202  around the entire perimeter of the tile base  202 . The facing material  204  conceals the stepped profile  228  of the opposing edge regions  206 ,  208  of the core panel  202  during suspension when viewed from below, in addition to at least partially concealing the grid  22  during suspension. 
     In this embodiment, the facing material  204  of the ceiling panel  200  is generally thinner than the facing material  104  of ceiling panel  100 . To give the edge regions of the facing material  204  thickness and rigidity, each pair of opposing perimeter edge regions  220 ,  222  of the facing material  204  are rolled, as shown in  FIG. 6 . As can be seen in the cross-sectional view of  FIG. 8 , the rolled edge regions  220  are formed by rolling the edge regions of the facing material  204  back over on top of the upper face  224  of the facing material. The other pair of perimeter edge regions  222  of the facing material  204  also are rolled in the same manner. To fully conceal the grid structure  22 , the perimeter rolled edge regions  220  of the adjacent facing material  204  of ceiling panels  200 A and  200 B extend to touch and seat flush against each other such that the flange  34  is fully concealed, as shown in  FIG. 8 . It also is appreciated that the other pair of perimeter rolled edge regions  222  extend to conceal the cross tee grid runners and also may mate with the edge region  222  of an adjacent ceiling panel to fully conceal the cross tee grid runners. As a result, the facing material  204  fully conceals the main tee grid runners and the cross tee grid runners to provide a monolithic suspended ceiling appearance. 
       FIG. 9  illustrates a ceiling panel  200  being installed and/or removed from a suspended position within the grid  22  using a lift-and-shift motion. Again, the installation of the ceiling panel  200  of this embodiment is accomplished by reversing the removal steps.  FIG. 9  shows adjacent parallel main tee grid runners  12 ,  14  with a series of three adjacent ceiling panels  200 A,  200 B, and  200 C. To remove ceiling panel  200 B, the same general series of steps are followed as outlined above for ceiling panel  100 B. That is, the ceiling panel  200 B is lifted vertically until the facing material  204  along sides  206 ,  208  is generally adjacent the flanges  34  of main tee grid runners  12 ,  14  and positioned above the facing material  204  of adjacent ceiling panels  200 A and  200 C. The ceiling panel  200 B is then shifted to the right toward ceiling panel  200 C. When the ceiling panel  200 B is shifted to the right, the facing material  204  on side  206  of the ceiling panel  200 B is inserted in the space between flange  34  of main tee grid runner  12  and the facing material  204  of ceiling panel  200 C. In addition, side  36  of the main tee grid runner  12  is positioned within the positioning kerf  216  of side  206  of the ceiling panel  200 B. As the ceiling panel  200 B is further shifted to the right, the tile base  202  of the opposing side  208  of the ceiling panel  200 B shifts clear of the flange  34  of main tee grid runner  14  and is able to drop down. As the side  208  of the ceiling panel  200 B continues to drop, the facing material  204  of side  206  is removed from the space between the flange  34  of main tee grid runner  12  and the facing material  204  of ceiling panel  200 C and also is free to drop down such that panel  200 B can be removed. 
     Referring now to  FIGS. 10-14 , there is illustrated a third embodiment of a ceiling panel  300  to be used in the grid structure  22  of  FIG. 1 . As with ceiling panels  100  and  200 , the ceiling panel  300  of this embodiment comprises a tile base  302  and a facing material  304  secured across a lower face  336  of the tile base  302 . The core tile or tile base  302  has generally the same configuration as the tile base  102  of ceiling panel  100 , including a stepped perimeter profile  328  along a pair of opposing edge regions  306 ,  308  and vertically extending linear walls along a pair of opposing side regions  310 ,  312 . The stepped perimeter profile  328  is comprised of a horizontal support kerf  314  and a horizontal positioning kerf  316  positioned below the support kerf  314 , with each kerf  314 ,  316  configured similarly to the kerfs  114 ,  116  of ceiling panel  100 . 
     The facing material  304  of the ceiling panel  300  has a first pair of opposing edge regions  320  adjacent the stepped profile  328  of edge regions  306 ,  308  of the tile base  302  and a second pair of opposing edge regions  322  adjacent the side regions  310 ,  312  of the tile base  302 . As with the facing material  104  of ceiling panel  100 , the facing material  304  of this embodiment is sized to extend beyond an edge of the lower face  336  of the tile base  302 . The facing material  304  preferably extends beyond the tile base  302  around the entire perimeter of the tile base  302 . The facing material  304  conceals the stepped profile  328  of the opposing edge regions  306 ,  308  of the core panel  302  during suspension when viewed from below, in addition to at least partially concealing the grid  22  during suspension. 
     In this embodiment, an edge segment  326  of the facing material  304  is upturned toward the tile base  302 . The facing material  304  preferably has upturned edge segments  326  along the entire perimeter of edge regions  320 ,  322 . As shown in  FIG. 12 , when the ceiling panel  300  is suspended from a main tee grid runner  12 , the upturned edge segments  326  of adjacent ceiling panels  300 A and  300 B are angled toward the flange  34  of the grid runner  12 . As a result, the upturned edge segments  326  conceal the stepped profile  328  of the opposing edge regions  306 ,  308  of the tile base  302  and also partially conceal the flange  34  of the grid runner  12 . It also is appreciated that upturned edge segments  326  adjacent opposing side regions  310 ,  312  partially conceal the cross tee grid runners. The facing material  304 , including the upturned edge segments  326 , is preferably made of a resilient flexible material. The resilient nature of the material will assist in the installation and removal of the ceiling panel  300 . While the ceiling panel  300  is shown to partially conceal the grid runners, in alternative embodiments the edge regions  320  may have edge segments upturned at such an angle and/or have a certain length to entirely conceal the grid runners, 
       FIGS. 13 and 14  illustrate a ceiling panel  300  being installed and/or removed from a suspended position within the grid  22  using a lift-and-shift motion. Again, the basic steps are generally the same as those described for ceiling panels of  100  and  200 . The installation of the ceiling panel  300  of this embodiment is accomplished by reversing the removal steps.  FIG. 13  shows adjacent parallel main tee grid runners  12 ,  14  with a series of three adjacent ceiling panels  300 A,  300 B, and  300 C. To remove ceiling panel  300 B, the same general series of steps are followed as outlined above for ceiling panel  100 B. The ceiling panel  300 B first is lifted vertically until the flanges  34  of main tee grid runner  12 ,  14  are generally aligned with the positioning kerf  314  of sides  306 ,  308  of the ceiling panel  300 B, with the upturned edge segment  326  of the resilient facing material  304  flattening as the upturned edge segment  326  is forced into contact with the flange  34 . The ceiling panel  300 B is then shifted to the right toward ceiling panel  300 C. When the ceiling panel  300 B is shifted to the right, the outer edge region  320  of the now flattened upturned edge segment  326  of ceiling panel  300 B pushes against the outer edge region  320  of adjacent upturned edge segment  326  of ceiling panel  300 C, causing the upturned edge segment  326  of ceiling panel  300 C to flex to create a deeper bend in the facing material  304 , as illustrated in  FIG. 14 . As a result, the ceiling panel  300 B is able to shift further to the right. Due to the resilience of the facing material  304 , the facing material  304  of ceiling panel  300 C absorbs the force applied by the facing material  304  of ceiling panel  300 B by flexing and the contact does not result in the ceiling panel  300 C being pushed off of the main tee grid runner  12 . As the ceiling panel  300 B is further shifted to the right, the tile base  302  of the opposing side  308  of the ceiling panel  300 B shifts clear of the flange  34  of main tee grid runner  12  and is then able to drop down. As the side  308  of the ceiling panel  300 B continues to drop, the facing material  304  of side  306  is removed from the space between the flange  34  of main tee grid runner  12  and the facing material  304  of ceiling panel  300 C and also is free to drop down such that panel  300 B can be removed. As the straightened upturned edge segment  326  of the facing material  304  of ceiling panel  300 B moves out of contact with the flange  34 , the resilient nature of the facing material  304  causes the upturned edge segment  326  to return to the original upturned shape. Likewise, as the upturned edge segment  326  of ceiling panel  300 C moves out of contact with the upturned edge segment  326  of ceiling panel  300 B, the upturned edge segment  326  releases from the deeper bend and returns to the original upturned shape. 
     Referring now to  FIGS. 15-22 , there is illustrated a fourth embodiment of a ceiling panel  400  to be used in the grid structure  22  of  FIG. 1 . The ceiling panel of this embodiment comprises a frame  402  and a facing material  404  secured across the frame  402 . Again, both the frame  402  and the facing material  404  are shown as being generally rectangular in shape, although other shapes are contemplated. The facing material  404  generally functions to provide an aesthetically pleasing and generally monolithic ceiling appearance. The frame  402  provides a support structure to which the facing material  404  is secured and also provides the suspension structure for the ceiling panel  400  such that the ceiling panel  400  engages with and is supported by the grid  22 . 
     In this embodiment, the frame  402  generally comprises a base frame portion  420  having a first pair of opposing side wall segments  406 ,  408  and a second pair of opposing side wall segments  410 ,  412 . Referring now to  FIG. 17 , the frame  402  is preferably formed from a length  436  of roll-formed metal. The general profile of each side wall segment  406 ,  408 ,  410 ,  412  is formed during the roll-forming process. The frame  402  is factory adjustable by making varying lengths  436  of the roll-formed metal such that varying widths and lengths of ceiling panels  400  can be produced. Notches  430 ,  432 ,  434  are then formed in the roll-formed length  436  such that the length  436  can be folded or bent at each notch  430 ,  432 ,  434  to assemble the frame  402 . As is illustrated in the corner detail shown in  FIG. 18 , each corner  438  may optionally have an overlapping tab  440  for spot welding to secure the frame  402  in its assembled form. 
     When assembled, the side wall segments  406 ,  408 ,  410 ,  412  define a generally rectangular border frame to which the facing material  404  is secured. As illustrated in  FIG. 16 , the facing material  404  of this embodiment has center portion  424  having a generally rectangular configuration, with the center portion  424  being sized to generally match the size of the frame  402 . In addition, the facing material  404  includes flap portions  418  along each side of the center portion  424 . The center portion  424  of the facing material  404  extends across the bottom of the side wall segments  406 ,  408 ,  410 ,  412 , and the flap portions  418  are then folded up along the side wall segments  406 ,  408 ,  410 ,  412  and secured thereto. The flap portions  418  are secured to the side wall segments  406 ,  408 ,  410 ,  412  using any suitable securing means, such as, for example, by chemically attaching the flap portions  418  using a glue or adhesive or any known mechanical means. 
     In this embodiment, the base frame portion  420  of the frame  402  has a first pair of top facing walls  426  extending generally transverse to side wall segments  406 ,  408  and a second pair of top facing walls  442  extending generally transverse to side wall segments  410 ,  412 . The first pair of top facing walls  426  each has a support extension  422  extending therefrom, with the support extension  422  extending from a rolled edge  444  of the top facing walls  426  and toward the outer side wall segments  406 ,  408 . The support extension  422  extends over generally two-thirds of the top facing wall  426  and extends generally along the entire length of the top facing wall  426 . The support extension  422  has a stepped perimeter profile  428  for being supported by a main tee grid runner during suspension. By another optional approach, a plurality of shortened support extensions may be positioned along the length of the top facing wall  426 . 
     The stepped profile  428  of each support extension  422  is comprised of a horizontal support step  414  starting from the outermost end region of the support extension  422 . A horizontal positioning step  416  is formed below the support step  414 , with the horizontal positioning step  416  extending to the rolled edge  444  of the top facing wall  426 . The support step  414  of this embodiment generally functions to provide a suspension surface for the ceiling panel  400 , with the support step  414  being supported by the flange  34  of the main tee grid runner  12  during suspension of the ceiling panel  400 , as illustrated in  FIGS. 19 and 20 . The support step  414  also assists in accurately positioning the ceiling panel  400  on the grid flange  34 . As shown, the support step  414  has a height generally equal to the thickness of the flange  34  of the main tee grid runner  12 . The positioning step  416  allows for the lift and shift installation and/or removal of the ceiling panel  400  from the grid  22 . 
       FIGS. 19-21  show the installed condition of the ceiling panel  400 . The ceiling panel  400  of this embodiment is supported on opposing side walls  406 ,  408  by the support extensions  422  hanging on the flange  34  of the main tee grid runners  12 ,  14 , with the support step  414  of each support extension  422  engaging with the grid flange  34 . When suspended, the top facing wall  420  of the frame  402  extends under a side  36 ,  38  of the grid flange  34  to partially conceal the main tee grid runner  12 . The frame  402  is then generally, if not fully, concealed by the facing material  404  secured thereto. As a result, when viewed from below, the main tee grid runners  12 ,  14  are at least partially concealed by the facing material  404  to provide a more monolithic appearance. 
       FIG. 22  illustrates a ceiling panel  400  of this embodiment being installed and/or removed from a suspended position within the grid  22  using a lift-and-shift motion. Adjacent parallel main tee grid runners  12 ,  14  are shown with a series of three adjacent ceiling panels  400 A,  400 B, and  400 C. In this illustration, ceiling panel  400 B is being removed. As the ceiling panels are symmetrical in that there is a support extension  422  having a stepped profile  428  along opposing top facing walls of the frame  402 , it is understood that the installation and/or removal may be performed using the features of either support extension  422 . 
     To begin removal, the ceiling panel  400 B of this embodiment is lifted vertically until the top facing wall  426  contacts the flange  34  of each main tee grid runner  34  and the flange  34  is generally aligned with the positioning step  416  along side walls  406 ,  408 . The ceiling panel  400 B is then shifted to the right toward ceiling panel  400 C. When the ceiling panel  400 B is shifted to the right, the flange  34  of main tee grid runner  12  is inserted into the positioning step  416  of the support extension  422  on side wall  406 . As the ceiling panel  400 B is further shifted to the right, the support extension  422  of side wall  408  shifts clear of the flange  34  of main tee grid runner  14  and is able to drop down. As the side wall  408  of the ceiling panel  400 B continues to drop, the facing material  404  of side wall  406  is removed from the space between the flange  34  of main tee grid runner  12  and the facing material  404  of ceiling panel  400 C and is also free to drop down such that panel  400 B can be removed. 
     With reference to  FIGS. 23-32 , there is illustrated a perspective view of a fifth embodiment of a ceiling panel  500 , to be used in the grid structure  22  of  FIG. 1 . The ceiling panel  500  of this embodiment comprises a frame  502  and a facing material  504  secured across the frame  502 . The facing material  504  provides an aesthetically pleasing and generally monolithic ceiling appearance. The frame  502  provides support structure to which the facing material  504  is secured and also provides the suspension structure for the ceiling panel  500  such that the ceiling panel  500  engages with and is supported by the grid  22 . 
     The frame  502  of this embodiment generally comprises a first pair of opposing sides  506 ,  508  and a second pair of opposing sides  510 ,  512 . The sides  506 ,  508 ,  510 ,  512  form a generally rectangular border frame to which the facing material  504  is secured. As illustrated in  FIG. 24 , the facing material  504  has a center portion  524  having a generally rectangular configuration, with the center portion  524  being sized to generally match the size of the frame  502 . In addition, the facing material  504  includes flap portions  518  along each side of the center portion  524 , which are secured to the frame  502 . 
     In this embodiment, the frame  502  has upstanding main walls  516  and base walls  522  along each side  506 ,  508 ,  510 ,  512  that are generally perpendicular to the main walls  516  to form a generally L-shaped cross-section. A lip  520  extends away transversely from a distal end of the base wall  522 . The flap portions  518  of the facing material  504  are secured to the lip  520  of each side  506 ,  508 ,  510 ,  512 . Along each side  506 ,  508 , a pair of support flanges  514  are formed generally perpendicular to the main wall  516 . The support flanges  514  are each bent outwardly of the frame  502 , with the support flanges  514  being used to support the ceiling panel  500  during suspension. The support flange  514  extends generally parallel to the base wall  522 , with the base wall  522  extending further in length than the support flange  514 . Each support flange  514  on side  506  is generally aligned laterally with the support flanges  514  on the opposing side  508 . Each support flange  514  is positioned generally adjacent a corner  538  of the frame  502 , although other locations are contemplated. Although a pair of flanges  514  are shown on each side  506 ,  508 , it should be noted that there may be any number of support flanges  514  along the sides  506 ,  508 , with the support flanges  514  positioned anywhere along the length of the sides  506 ,  508 . In addition, the support flanges  514  may be any length and, by one optional approach, a single support flange  514  may extend the length of a side  506 ,  508 . 
     Referring now to  FIG. 25 , the frame  502  of this embodiment is preferably formed from a length  536  of roll-formed metal. The general profile of each side walls  506 ,  508 ,  510 ,  512  is formed during the roll-forming process. The frame  502  is factory adjustable by making varying lengths  536  of the roll-formed metal such that varying widths and lengths of ceiling panels  500  can be produced. Support flanges  514  are then cut along the length  536 . Notches  530 ,  532 ,  534  are then formed in the roll-formed length  536  such that the length  536  can be hinged and folded or bent at each notch  530 ,  532 ,  534  to assemble the frame  502 . After folding, each corner  538  may optionally be spot welded to secure the frame  502  in its assembled form. 
     As is illustrated in the corner details shown in  FIGS. 26 and 27 , the notches  530 ,  532 ,  534  formed along the frame length  536  form a corner  538  with a specific profile when folded.  FIG. 26  shows a top view of a corner of this embodiment, and  FIG. 27  shows a perspective view of a corner  538 . Corner angled walls  526 ,  528  extend from the main wall  516 . The walls  526 ,  528  are folded to seat flush against each other and each has an identical profile, including a rectangular wall  540  and a stepped wall  544 . The rectangular wall  540  and the stepped wall  544  are separated by a notch  542 . 
       FIGS. 28-30  show the installed condition of the ceiling panel  500 . The ceiling panel  500  of this embodiment is supported on opposing side walls  506 ,  508  by the support flanges  514  hanging on the flange  34  of the main tee grid runners  12 ,  14 . When suspended, the base wall  522  of the frame  502  extends under a side  36 ,  38  of the grid flange  34  to at least partially conceal the main tee grid runner  12 . The frame  502  is then fully concealed by the facing material  504  being secured thereto. In addition, the flap portion  518  secured to the lip  520  serves to fill the space between the lips  520  of the adjacent ceiling panels  500 A and  500 B to further conceal the main tee grid runner  12 . As a result, when viewed from below, the main tee grid runners  12 ,  14  are at least partially concealed by the facing material  504  to provide a generally monolithic appearance. In addition, the base wall  522  of the frame  502  along opposing sides  510 ,  512  conceals the cross tee grid runners in the same manner. 
       FIGS. 31-32  illustrate a ceiling panel being removed from a suspended position within the grid  22  using a lift-and-shift motion. Adjacent parallel main tee grid runners  12 ,  14  are shown with a series of three adjacent ceiling panels  500 A,  500 B, and  500 C. The removal of the ceiling panel  500  will be described, with the installation of the ceiling panel  500  being accomplished by the same series of steps being performed in reverse order and in the reverse directions. 
     To begin removal, the ceiling panel  500 B of this embodiment is lifted upward vertically until the lip  520  of side walls  506 ,  508  contacts the flange  34 . The ceiling panel  500 B is then shifted to the right toward ceiling panel  500 C (although the removal may also be completed by shifting the ceiling panel  500 B to the left toward ceiling panel  500 A). When the ceiling panel  500 B is shifted to the right, the lip  520  on side wall  506  of ceiling panel  500 B is inserted in the space between the flange  34  of main tee grid runner  12  and the lip  520  of ceiling panel  500 C. As the ceiling panel  500 B is further shifted to the right, the support flange  514  of the opposing side wall  508  of the ceiling panel  500 B clears the flange  34  of main tee grid runner  14  and is able to drop down. As the side wall  508  of the ceiling panel  50013  continues to drop, the lip  520  of side wall  506  is removed from the space between the flange  34  and the lip  520  of panel  500 C and also is free to drop down such that the panel  500 B can be removed. 
     With reference to  FIGS. 33-36 , there is illustrated a sixth embodiment of a ceiling panel  600 , to be used in the grid structure  22  of  FIG. 1 . The ceiling panel of this embodiment comprises a frame  602  and a facing material  604  secured across the frame  602 . The facing material  604  generally functions to provide an esthetically pleasing and generally monolithic ceiling appearance. The frame  602  provides support structure to which the facing material  604  is secured and also provides the suspension structure for the ceiling panel  600  such that the ceiling panel  600  engages with and is supported by the grid. The frame  602  is preferably formed from a length of roll-formed metal. When assembled, the frame  602  has a generally rectangular configuration, with the facing material  604  extending across the bottom of the frame  602  and secured thereto. 
     The frame  602  of this embodiment has a stepped perimeter profile  628  along a first pair of opposing sides  606 ,  608 . A second pair of opposing sides  610 ,  612  comprise upstanding sidewalls, although other profile options may be used. The stepped profile  628  is comprised of a vertical riser  630  extending to a horizontal support step  614 . A positioning step  616  is formed below the support step  614 , with the positioning step  616  extending horizontally deeper than the support step  614  to complete the stepped profile  628 . The support step  614  generally functions to provide a suspension surface for the ceiling panel  600 , with the support step  614  being supported by the flange  34  of the main tee grid runner  12  during suspension of the ceiling panel  600 , as shown in  FIGS. 35 and 36 . The support step  614  also assists in accurately positioning the ceiling panel  600  on the grid flange  34 . The positioning step  616  allows for the lift and shift installation and/or removal of the ceiling panel  600  from the grid  22 . A horizontal extension wall  632  extends from the back wall  634  of the positioning step  614  to a point beyond the riser  630 . The extension wall  632  preferably extends generally to a mid-point of the grid runner  12  web  34  such that the extension wall  632  conceals a side  36  or  38  of the flange  34  during suspension. The extension wall  632  connects to a lower face wall  636 . The lower face wall  636  extends below the extension wall  632  to a point beyond the back wall  634  of the positioning step  614 . The facing material  604  is secured to the lower face wall  636  using any suitable securing means, such as, for example, by chemically attaching the flap portions using a glue or adhesive or any known mechanical means. 
       FIGS. 35 and 36  show the installed condition of the ceiling panel  600  of this embodiment. The ceiling panel is supported on opposing sides by the support step  614  hanging on the flange  34  of the main tee grid runners  12 ,  14 . When suspended, the lower face wall  636  of the frame  602  extends under a side  36 ,  38  of the grid flange  34  to conceal the main tee grid runner  12 . The frame  602  is then substantially, if not fully, concealed by the facing material  604  secured thereto. As a result, when viewed from below, the main tee grid runners  12 ,  14  are at least partially concealed, and preferably fully concealed, by the facing material  604  to provide a monolithic appearance. 
       FIG. 36  illustrates a ceiling panel  600  being installed and/or removed from a suspended position within the grid  22  using a lift-and-shift motion. Adjacent parallel main tee grid runners  12 ,  14  are shown with a series of three adjacent ceiling panels  600 A,  600 B, and  600 C. In this illustration, ceiling panel  600 B is being removed. As the ceiling panels are symmetrical in that there is a stepped profile  628  along opposing edge regions  606 ,  608 , it is understood that the installation and/or removal may be performed using the stepped profile  628  feature along either side. 
     To begin removal, the ceiling panel  600 B of this embodiment is lifted vertically until the extension wall  632  along sides  606 ,  608  is generally adjacent the flanges  34  of main tee grid runners  12 ,  14  and the flanges  34  are generally aligned with the positioning step  616 . The ceiling panel is then shifted to the left toward ceiling panel  600 A. When the ceiling panel  600 B is shifted to the left, the extension wall  632 , lower face wall  636 , and the facing material  604  secured thereto on side  608  of the ceiling panel  600 B is inserted in the space between flange  34  of main tee grid runner  14  and the extension wall  632  of ceiling panel  600 C. In addition, side  38  of the main tee grid runner  14  is positioned within the positioning step  616  of side  608  of the ceiling panel  600 B. As the ceiling panel  600 B is further shifted to the left, the support step  614  of side  606  of the ceiling panel  600 B shifts clear of the flange  34  of main tee grid runner  12  and is able to drop down. As the side  608  of the ceiling panel  600 B continues to drop, the extension wall  632 , lower face wall  636 , and the facing material  604  secured thereto on side  608  is removed from the space between the flange  34  of main tee grid runner  14  and the extension wall  632  of ceiling panel  600 C and is also free to drop down such that panel  600 B can be removed. 
     With reference to  FIGS. 37-40 , there is illustrated a seventh embodiment of a ceiling panel  700 , to be used in the grid structure  22  of  FIG. 1 . The ceiling panel of this embodiment comprises a frame  702  and a facing material  704  secured across the frame  702 . The facing material  704  generally functions to provide an aesthetically pleasing and generally monolithic ceiling appearance. The frame  702  provides support structure to which the facing material  704  is secured and also provides the suspension structure for the ceiling panel  700  such that the ceiling panel  700  engages with and is supported by the grid. The frame  702  is preferably formed from a length of roll-formed metal. When assembled, the frame  702  has a generally rectangular configuration, with the facing material  704  extended across the bottom of the frame  702  and secured thereto. 
     The frame  702  of this embodiment has a stepped upper profile  728  connected to an angled wall  730  along a first pair of opposing sides  706 ,  708 . A second pair of opposing sides  710 ,  712  comprise upstanding sidewalls, although other profile options may be used. The stepped profile  728  is comprised of a horizontal support step  714  and a positioning step  716  formed below the support step  714 , with the positioning step  716  extending horizontally deeper than the support step  714  to complete the stepped profile  728 . The support step  714  generally functions to provide a suspension surface for the ceiling panel  700 , with the support step  714  being supported by the flange  34  of the main tee grid runner  12  during suspension of the ceiling panel  700 , as shown in  FIGS. 39 and 40 . The support step  714  also assists in accurately positioning the ceiling panel  700  on the grid flange  34 . A top facing wall  734  optionally extends over the support step  714  to provide rigidity and support to the support step  714  being suspended from the flange  34 . An angled wall  730  extends from the positioning step  716 , and angles downwardly toward the center of the flange  34  during suspension. The angled wall  730  has a curved lip  732  at a terminal end thereof. The lip  732  hems over the facing material  704  to catch the facing material  704  and secure the facing material  704  to the frame  702 . The stepped profile  728  and angled wall  730  allow for the lift and shift installation and/or removal of the ceiling panel  700  from the grid  22 . 
       FIGS. 39 and 40  show the installed condition of the ceiling panel  700 . The ceiling panel  700  is supported on opposing sides  706 ,  708  by the support step  716  hanging on the flange  34  of the main tee grid runners  12 ,  14 . When suspended, a portion of the angled wall  730  and the curved lip  732  of the frame extend under side  36 ,  38  of the grid flange  34  to partially conceal the main tee grid runner  12 . The frame  702  is then fully concealed by the facing material  704  secured thereto. As a result, when viewed from below, the main tee grid runners  12 ,  14  are at least partially concealed by the facing material  704 . 
       FIG. 40  illustrates a ceiling panel  700  of this embodiment being installed and/or removed from a suspended position within the grid  22  using a lift-and-shift motion. Adjacent parallel main tee grid runners  12 ,  14  are shown with a series of three adjacent ceiling panels  700 A,  700 B, and  700 C. In this illustration, ceiling panel  700 B is being removed. As the ceiling panels are symmetrical in that there is a stepped profile  728  along both opposing edge regions  706 ,  708 , it is understood that the installation and/or removal may be performed using the stepped profile  728  feature along either side. 
     To begin removal, the ceiling panel  700 B of this embodiment is lifted vertically until the flange  34  of main tee grid runners  12 ,  14  is aligned with the positioning step  716 . The ceiling panel  700 B is then shifted to the left toward ceiling panel  700 A. When the ceiling panel  700 B is shifted to the left, the lip  732  and the facing material  704  secured thereto on side  708  of the ceiling panel  700 B is inserted in the space between flange  34  of main tee grid runner  14  and the lip  732  of ceiling panel  700 A. In addition side  38  of the main tee grid runner  14  is positioned within the positioning step  716  of side  708  of the ceiling panel  700 B. As the ceiling panel  700 B is further shifted to the left, the support step  714  of side  706  of the ceiling panel  700 B shifts clear of the flange  34  of the main tee grid runner  12  and is able to drop down. As the side  708  of the ceiling panel  700 B continues to drop, the lip  732  and the facing material  704  secured thereto on side  708  is removed from the space between the flange  34  of main tee grid runner  14  and the lip  732  of ceiling panel  700 C and is also free to drop down such that panel  700 B can be removed. 
     With reference to  FIGS. 41-44 , there is illustrated an eighth embodiment of a ceiling panel  800  to be used in the grid structure  22  of  FIG. 1 . The ceiling panel of this embodiment comprises a frame  802  and a facing material  804  secured across the frame  802 . The facing material  804  generally functions to provide an aesthetically pleasing and generally monolithic ceiling appearance. The facing material  804  has a center portion  824  having a generally rectangular configuration, with the center portion  824  being sized to generally match the size of the frame  804 . In addition, the facing material  804  includes flap portions  818  along each side of the center portion  824 , which are secured to the frame  802 . The frame  802  provides support structure to which the facing material  804  is secured and also provides the suspension structure for the ceiling panel  800  such that the ceiling panel  800  engages with and is supported by the grid  22 . The frame  802  is preferably formed from a length of roll-formed metal. When assembled, the frame  802  has a generally rectangular configuration, with the facing material  804  extended across the bottom of the frame  802  and secured thereto. 
     The frame  802  of this embodiment has a first pair of opposing angled side walls  806 ,  808  and a second pair of opposing angled side walls  810 ,  812 . An upstanding lip  820  extends from a terminal end of the angled side walls  806 ,  808 ,  810 ,  812 . The flap portions  818  of the facing material  804  are secured to the lip  820  of each angled side  806 ,  808 ,  810 ,  812 . Angled side walls  806 ,  808  connect to top facing wall  822  and angled side walls  810 ,  812  connect to top facing wall  826 . The top facing wall  826  overlays the top facing wall  822  in the corner regions  836  of the frame  802 . In addition, top facing wall  826  has a support flange  814  extending from each end thereof over angled side walls  806 ,  808 . The support flange  814  is elevated above the plane of the top facing wall  826  by a riser  816 . Although a pair of support flanges  814  are shown extending over each angled side wall  806 ,  808 , it should be noted that there may be any number of support flanges  814  extending over angled side walls  806 ,  808 , with the support flanges  814  positioned anywhere along the length of the angled side walls  806 ,  808 . In addition, the support flanges  814  may be any length. 
       FIG. 43  shows the installed condition of ceiling panels  800 A and  800 B of this embodiment. The ceiling panels  800 A,  800 B are supported by the support flanges  814  hanging on the flange  34  of the main tee grid runner  12 . When suspended, the angled walls  806 ,  808  extend under a side  36 ,  38  of the flange  34  to at least partially conceal the main tee grid runner  12 . The frame  802  is then fully concealed by the facing material  804  being secured thereto. In addition, the flap portion  818  secured to the lip  820  serves to fill the space between the lips  820  of the adjacent ceiling panels  800 A and  800 B to further conceal the main tee grid runner  12 . As a result, when viewed from below, the main tee grid runner  12  is at least partially concealed by the facing material  804  to provide a generally monolithic appearance. In addition, the angled walls  810 ,  812  conceal the cross tee grid runners in the same manner. 
     To begin removal, the ceiling panel  800 B of this embodiment is lifted vertically until the lip  820  is generally adjacent the flange  34  of main tee grid runners  12 ,  14  and aligned with the space between the flange  34  and the lip  820  of ceiling panel  800 A. The ceiling panel  800 B is then shifted to the left toward ceiling panel  800 A. When the ceiling panel  800 B is shifted to the left, the lip  820  and the facing material  804  secured thereto on side  808  of the ceiling panel  800 B is inserted in the space between flange  34  of main tee grid runner  14  and the lip  820  of ceiling panel  800 A. As the ceiling panel  800 B is further shifted to the left, the support flange  814  adjacent side  808  of the ceiling panel  800 B shifts clear of the flange  34  of the main tee grid runner  12  and is able to drop down. As the side  808  of the ceiling panel  800 B continues to drop, the lip  820  and the facing material  804  secured thereto on side  808  is removed from the space between the flange  34  of main tee grid runner  14  and the lip  820  of ceiling panel  800 C and is also free to drop down such that panel  800 B can be removed. 
     Those skilled in the art will recognize that a wide variety of modifications, alterations, and combinations can be made with respect to the above described embodiments without departing from the spirit and scope of the invention, and that such modifications, alterations, and combinations are to be viewed as being within the ambit of the inventive concept.