Ceiling system

1. A suspended ceiling system comprising:

a ceiling support grid comprising a plurality of intersecting grid support members forming openings between the grid support members;

a plurality of ceiling panels mounted to the grid support members of the support grid, each ceiling panel having a top surface and covering at least two openings, each ceiling panel further comprising profiled first and second edges that engage parallel first and second grid support members respectively and at least one intermediate channel in the top surface between the first and second edges, the intermediate channel defining a seating surface that engages a third grid support member arranged parallel to and between the first and second grid support members.

2. The suspended ceiling system according to claim 1 , wherein the first edge comprises and outwardly open first edge channel and the second edge comprises an outwardly open second edge channel, the first edge channel defining a downwardly facing first surface that engages the first grid support member and the second edge channel defining a downwardly facing second surface that engages the second grid support member.

3. The suspended ceiling system according to claim 2 , wherein the first and second surfaces of the first and second edge channels each engage horizontal bottom flanges of their respective first and second grid support members.

4. The suspended ceiling system according to claim 1 , wherein the grid support members have an inverted T-shape.

5. The suspended ceiling system according to claim 1 , wherein the seating surface of the intermediate channel is defined on the underside of a cantilevered upper protrusion that extends into the intermediate channel from the ceiling panel.

6. The suspended ceiling system according to claim 5 , wherein the third grid support member includes a bottom flange which is nested within the intermediate channel and partially beneath the upper protrusion.

7. The suspended ceiling system according to claim 6 , wherein the intermediate channel includes an upwardly open entrance slot formed in the top surface of the ceiling panel, the entrance slot having a width that is at least as wide as a width of the bottom flange of the third grid support member.

8. The suspended ceiling system according to claim 5 , wherein the cantilevered upper protrusion is formed as an integral unitary structural part of the ceiling panel.

9. The suspended ceiling system according to claim 1 , wherein the intermediate channel is arranged parallel to the first and second edges of the ceiling panel.

10. A method for mounting a ceiling panel in a suspended ceiling system, the method comprising:

providing a support grid including first, second, and third grid support members arranged in parallel relationship, the third grid support member disposed between the first and second grid support members;

engaging a first edge of a ceiling panel with the first grid support member by moving the ceiling panel in a first axial direction;

pivoting the ceiling panel about the first edge;

raising a second edge of the ceiling panel opposite the first edge upwards to engage the second grid support member;

inserting the third grid support member into an elongated channel formed in a top surface of the ceiling panel between the first and second edges;

sliding the ceiling panel in a second axial direction opposite to the first axial direction; and

lockingly engaging a downward facing seating surface defined by each of the first edge, second edge, and channel with the first, second, and third grid support members respectively, wherein the ceiling panel cannot be vertically withdrawn from the support grid.

11. The method according to claim 10 , wherein the first, second, and third grid support members each include a bottom flange that engages a respective one of the seating surfaces defined by the first edge, second edge, and channel.

12. The method according to claim 11 , wherein bottom flange of the third grid support member is fully inserted into the channel.