Ceiling air conditioning system

Claim 1

A CEILING STRUCTURE FOR AN AIR CONDITIONING SYSTEM IN A BUILDING, SAID STRUCTURE COMPRISING: A DROPPED TRANSVERSE CEILING SPACED FROM THE CEILING OF A FLOOR OF THE BUILDING, TO FORM A PLENUM CHAMBER BETWEEN THE FLOOR CEILING AND THE DROPPED CEILING, SAID DROPPED CEILING INCLUDING AT LEAST ONE ELONGATED PANEL HAVING A TRANSVERSE BOTTOM OF OPEN CONSTRUCTION TO PERMIT AIR FLOW THERETHROUGH IN EITHER DIRECTION; FIRST AND SECOND AIR DUCT MEANS EXTENDING INTO THE PLENUM CHAMBER, ONE OF SAID FIRST AND SECOND DUCT MEANS BEING CONNECTED TO A SOURCE OF AIR-CONDITIONED AIR UNDER PRESSURE, AND THE OTHER ONE OF SAID FIRST AND SECOND DUCT MEANS PROVIDING A RETURN AIR FLOW PASSAGE; AT LEAST ONE HOLLOW BOX-SHAPED UNIT, SAID UNIT BEING DISPOSED ON A PORTION OF, AND SUPPORTED BY, SAID PANEL, AND, WITH SAID PANEL, FORMING A HOLLOW BOX HAVING A TOP, TOW SIDEWALLS, TWO END WALLS AND AN OPEN TRANSVERSE BOTTOM WALL; ONE OF SAID FIRST AND SECOND AIR DUCT MEANS BEING IN AIR FLOW COMMUNICATION WITH THE INTERIOR OF SAID UNIT THROUGH AN OPENING THEREIN ABOVE SAID TRANSVERSE BOTTOM WALL; AT LEAST ONE MASKING MEMBER SEATED ON ANOTHER PORTION OF SAID PANEL THEREBY TO PREVENT AIR FLOW THROUGH THE OPEN AREAS OF THE TRANSVERSE BOTTOM OF SAID OTHER PORTION OF THE PANEL; AND AT LEAST ONE ADDITIONAL PORTION OF THE TRANSVERSE BOTTOM OF SAID PANEL BEING LEFT UNCOVERED BY BOTH SAID UNIT AND SAID MASKING MEMBER, AND IN AIR FLOW COMMUNICATION WITH SAID PLENUM CHAMBER.