A fire sprinkler support assembly for supporting a flexible fire sprinkler fitting within a ceiling structure having parallel spaced beams, the support assembly comprising: a leg configured to extend transverse to each of a pair of adjacent ones of the parallel spaced beams, the leg including: a cross portion; and a clamp assembly for connecting and supporting an end of the cross portion of the leg to a corresponding one of the beams, the clamp assembly including: a first plate and a second plate, each plate (404,406) extending from and generally perpendicular to the leg; the second plate being generally parallel to the first plate; the first plate and the second plate configured to be disposed on opposing sides of a corresponding one of the beams such that the plates (404,406) are configured to straddle the beam; a rod passing through corresponding rod openings (412,413) in each of the first and second plates (404,406); and a lever pivotally connected to one end of the rod, the lever including a cam surface disposed adjacent to the first plate; characterized in that the clamp assembly is a levered clamp assembly comprising a lever assembly, and wherein the lever assembly is configured to reduce spacing between the plates (404,406) upon actuation of the lever, whereby the leg is secured to the beam; and wherein the first plate further includes a tongue opening, and the second plate further includes a tongue configured to protrude through the tongue opening in the first plate, the second plate rotatable relative to the first plate on the tongue; and the second plate is rotatable on the tongue to obtain adequate spacing to accept the beam. a cross portion; and a clamp assembly for connecting and supporting an end of the cross portion of the leg to a corresponding one of the beams, the clamp assembly including: a first plate and a second plate, each plate (404,406) extending from and generally perpendicular to the leg; the second plate being generally parallel to the first plate; the first plate and the second plate configured to be disposed on opposing sides of a corresponding one of the beams such that the plates (404,406) are configured to straddle the beam; a rod passing through corresponding rod openings (412,413) in each of the first and second plates (404,406); and a lever pivotally connected to one end of the rod, the lever including a cam surface disposed adjacent to the first plate; characterized in that the clamp assembly is a levered clamp assembly comprising a lever assembly, and wherein the lever assembly is configured to reduce spacing between the plates (404,406) upon actuation of the lever, whereby the leg is secured to the beam; and wherein the first plate further includes a tongue opening, and the second plate further includes a tongue configured to protrude through the tongue opening in the first plate, the second plate rotatable relative to the first plate on the tongue; and the second plate is rotatable on the tongue to obtain adequate spacing to accept the beam. a first plate and a second plate, each plate (404,406) extending from and generally perpendicular to the leg; the second plate being generally parallel to the first plate; the first plate and the second plate configured to be disposed on opposing sides of a corresponding one of the beams such that the plates (404,406) are configured to straddle the beam; a rod passing through corresponding rod openings (412,413) in each of the first and second plates (404,406); and a lever pivotally connected to one end of the rod, the lever including a cam surface disposed adjacent to the first plate; characterized in that the clamp assembly is a levered clamp assembly comprising a lever assembly, and wherein the lever assembly is configured to reduce spacing between the plates (404,406) upon actuation of the lever, whereby the leg is secured to the beam; and wherein the first plate further includes a tongue opening, and the second plate further includes a tongue configured to protrude through the tongue opening in the first plate, the second plate rotatable relative to the first plate on the tongue; and the second plate is rotatable on the tongue to obtain adequate spacing to accept the beam.