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A ceiling system for under-deck installation includes ceiling panels and retaining clips. Each ceiling panel has a first interlocking bracket and an oppositely spaced second interlocking bracket formed along the sides of the ceiling panel. The ceiling system is installed by installing a number of re

A ceiling system for under-deck installation includes ceiling panels and retaining clips. Each ceiling panel has a first interlocking bracket and an oppositely spaced second interlocking bracket formed along the sides of the ceiling panel. The ceiling system is installed by installing a number of retaining clips along the length of the second interlocking bracket of a panel and then inserting the first interlocking bracket of the next panel in the second interlocking bracket of the first panel so that the retaining clips secure an edge of the first interlocking bracket of the next panel. Subsequent ceiling panels are connected in this manner to form the ceiling panel system.

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1. A ceiling panel system installable to supporting beams from beneath, comprising: a plurality of ceiling panels, the ceiling panels having a ceiling portion including a top surface, a first bracket formed along a first long side of the ceiling portion, including a first vertical wall extending upw

1. A ceiling panel system installable to supporting beams from beneath, comprising: a plurality of ceiling panels, the ceiling panels having a ceiling portion including a top surface, a first bracket formed along a first long side of the ceiling portion, including a first vertical wall extending upward at a right angle from the top surface of the ceiling portion, a first top portion extending from the first vertical wall at a right angle, and a first outwardly extending flange extending outward and downward from the first top portion at a first oblique angle, the ceiling panels further including a second bracket formed along a second long side of the ceiling portion opposite the first long side, the second bracket including a second vertical wall extending at a right angle to the top surface of the ceiling portion, an inwardly extending flange extending from the second vertical wall at an acute angle, and an outwardly extending member formed at a side of the inwardly extending flange opposite the second vertical wall and extending from the inwardly extending flange at a second oblique angle; anda plurality of retaining clips for installation at intervals along a length of the ceiling panels, the retaining clips including a retaining clip top portion and a retaining clip flange portion extending from the retaining clip top portion at the first oblique angle for placement along, respectively, the first top portion and the first outwardly extending flange of a first bracket of a corresponding one of the plurality of ceiling panels, the retaining clips further including an inwardly extending member extending from a lower portion of the retaining clip flange portion at an acute angle, so that when a second bracket of one of the ceiling panels is fitted within a first bracket of another one of the ceiling panels to which a number of the retaining clips have been installed along the length thereof, the second bracket of the one of the ceiling panels is captured by the inwardly extending members of the number of retaining clips. 2. The ceiling panel system of claim 1, further comprising a plurality of suspension rails for attaching the ceiling panels and retaining clips to deck joists, wherein the suspension rails have a top face and a bottom face, a separation distance between which changes along the lengths of the suspension rails. 3. The ceiling panel system of claim 2, wherein the supporting beams are a plurality of deck joists arranged under a plurality of decking planks fastened thereto and extending in a direction perpendicular to the desk joists, wherein the top faces of the plurality of suspension rails are fastened along lengths of the plurality of deck joists by fasteners, and wherein the ceiling panels and retaining clips are fastened via other fasteners to bottom faces of the suspension rails. 4. The ceiling panel system of claim 2, wherein the supporting beams are a plurality of deck joists arranged under a plurality of decking planks fastened thereto and extending in a direction perpendicular to the desk joists, wherein the top faces of the plurality of suspension rails are fastened to the plurality of deck joists by fasteners and are arranged in a direction perpendicular to the lengths of the plurality of deck joists, and wherein the ceiling panels and retaining clips are fastened via other fasteners to bottom faces of the suspension rails. 5. The ceiling panel system of claim 1, wherein the acute angle is less than 180 degrees (180°) minus the first oblique angle. 6. The ceiling panel system of claim 1, wherein a length of the retaining clips is such that a length of the gaps between the retaining clips along the length of the ceiling panels is greater than or equal to 50% of the length of the retaining clips. 7. The ceiling panel system of claim 1, wherein a length of the retaining clips is 8 inches or less. 8. A method of providing a ceiling system under a deck formed from a plurality of deck joists arranged in a parallel configuration, above which are fastened a plurality of deck planks perpendicular thereto, the method comprising: installing a first ceiling panel having a ceiling portion including a top surface, a first bracket formed along a first long side of the ceiling portion, including a first vertical wall extending upward at a right angle from the top surface of the ceiling portion, a first top portion extending from the first vertical wall at a right angle, and a first outwardly extending flange extending outward and downward from the first top portion at a first oblique angle, the ceiling panels further including a second bracket formed along a second long side of the ceiling portion opposite the first long side, the second bracket including a second vertical wall extending at a right angle to the top surface of the ceiling portion, an inwardly extending flange extending from the second vertical wall at an acute angle, and an outwardly extending member formed at a side of the inwardly extending flange opposite the second vertical wall and extending from the inwardly extending flange at a second oblique angle;second installing a plurality of retaining clips at intervals along a length of the ceiling panel, the retaining clips including a retaining clip top portion and a retaining clip flange portion extending from the retaining clip top portion at the first oblique angle, the retaining clips further including an inwardly extending member extending from a lower portion of the retaining clip flange portion at an acute angle;third installing a second ceiling panel identical to the first ceiling panel by fitting the second bracket of the second ceiling panel within the first bracket of the first ceiling panel and the retaining clips so that the second bracket of second ceiling panel is captured by the inwardly extending members of the number of retaining clips; andrepeating the second and third installing for a number of subsequent pluralities of retaining clips and subsequent ceiling panels. 9. The method of claim 8, further comprising prior to the first installing, the second installing and the third installing, installing a plurality of suspension rails for attaching the ceiling panels and retaining clips to deck joists, wherein the suspension rails have a top face and a bottom face, a separation distance between which changes along the lengths of the suspension rails, and wherein the first installing, the second installing and the third installing fasten the ceiling panels and the retaining clips to the suspension rails. 10. The method of claim 9, wherein the top faces of the plurality of suspension rails are fastened along lengths of the plurality of deck joists by fasteners, and wherein the ceiling panels and retaining clips are fastened via other fasteners to bottom faces of the suspension rails. 11. The method of claim 9, wherein the top faces of the plurality of suspension rails are fastened to the plurality of deck joists by fasteners and are arranged in a direction perpendicular to the lengths of the plurality of deck joists, and wherein the ceiling panels and retaining clips are fastened via other fasteners to bottom faces of the suspension rails. 12. The method of claim 8, wherein a length of the retaining clips is such that a length of the gaps between the retaining clips along the length of the ceiling panels is greater than or equal to 50% of the length of the retaining clips. 13. The method of claim 9, wherein a length of the retaining clips is 8 inches or less. 14. A method of manufacturing a ceiling panel system installable to supporting beams from beneath, comprising: first forming a plurality of ceiling panels, the ceiling panels having a ceiling portion including a top surface, a first bracket formed along a first long side of the ceiling portion, including a first vertical wall extending upward at a right angle from the top surface of the ceiling portion, a first top portion extending from the first vertical wall at a right angle, and a first outwardly extending flange extending outward and downward from the first top portion at a first oblique angle, the ceiling panels further including a second bracket formed along a second long side of the ceiling portion opposite the first long side, the second bracket including a second vertical wall extending at a right angle to the top surface of the ceiling portion, an inwardly extending flange extending from the second vertical wall at an acute angle, and an outwardly extending member formed at a side of the inwardly extending flange opposite the second vertical wall and extending from the inwardly extending flange at a second oblique angle; andsecond forming a plurality of retaining clips for installation at intervals along a length of the ceiling panels, the retaining clips including a retaining clip top portion and a retaining clip flange portion extending from the retaining clip top portion at the first oblique angle for placement along, respectively, the first top portion and the first outwardly extending flange of a first bracket of a corresponding one of the plurality of ceiling panels, the retaining clips further including an inwardly extending member extending from a lower portion of the retaining clip flange portion at an acute angle, so that when a second bracket of one of the ceiling panels is fitted within a first bracket of another one of the ceiling panels to which a number of the retaining clips have been installed along the length thereof, the second bracket of the one of the ceiling panels is captured by the inwardly extending members of the number of retaining clips. 15. The method of claim 14, wherein the first forming is performed by rolling metal sheet stock through a tool having directing members for bending the sheet stock to form the top surface, the first bracket and the second bracket at the sides of the ceiling panels. 16. The method of claim 14, wherein the first forming is performed by molding a plastic material to form the top surface, the first bracket and the second bracket at the sides of the ceiling panels. 17. The method of claim 14, wherein the retaining clips are formed by rolling metal stock through a tool having directing members for bending the metal stock. 18. The method of claim 14, wherein a length of the retaining clips is such that a length of the gaps between the retaining clips along the length of the ceiling panels when the retaining clips are installed is greater than or equal to 50% of the length of the retaining clips. 19. The method of claim 14, wherein a length of the retaining clips is 8 inches or less.