Abstract: Disclosed is a suspended ceiling support system which provides a ceiling which is essentially flush with its supporting members. The support system attaches to the lower surfaces of joists forming part of a floor and supports a plurality of ceiling tiles. The system comprises a plurality of elongated support members extending between adjacent joists, the support members being located in at least one row, at least one main tee runner extending parallel to the row of support members, at least two wishbone-shaped springs attached to the main tee runner and which each extend through an aperture in a support member such that the main tee runner can be supported in at least two positions relative to the support member, and at least two cross-tee runners extending perpendicular to the main tee runner, one end of each cross tee runner being supported on the main tee runner whereby the cross-tee runners and main tee runner are capable of supporting at least one ceiling tile.

Abstract: A highly reliable fluid cooling system is provided having a first and second cooling loop, each of which is adapted to provide cooling for separate sections of the system to be cooled. Each of the cooling loops is connected to an expansion tank at opposite sides of a partition therein. Crossover piping is provided at the discharge side of the first and second pumps connecting the first loop to the second loop and containing a normally open valve therein. In normal operation, the first pump is adapted for pumping fluid through both the first and second cooling loops via the crossover piping and the common expansion tank. A sensor is provided in each half of the partitioned expansion tank for sensing the drop in fluid level below the partition.