Dropped ceiling ventilator apparatus

Claim 1

A DROPPED CEILING CONSTRUCTION HAVING A RECTILINEAR SUPPORT GRID FOR CEILING ELEMENTS, AIR SUPPLY MEANS, AIR RETURN MEANS AND LIGHTING FIXTURES AND SUSPENSION MEANS FOR SUPPORTING SAID GRID AT A SELECTED LEVEL BENEATH THE STRUCTURAL CEILING OF A BUILDING, IN WHICH SAID SUPPORT GRID CONSISTS OF (1) A PLURALITY OF ELONGATED, INVERTED, GENERALLY T-SHAPED ELEMENTS, EACH OF SAID ELONGATED ELEMENTS HAVING AN OUTWARDLY TURNED FLANGE AT EACH SIDE OF ITS BOTTOM EDGE, SAID ELONGATED ELEMENTS BEING SPACED TO DEFINE RECTILINEAR MODULAR AREAS OF SAID DROPPED CEILING, SOME OF SAID ELONGATED ELEMENTS BEING AIR-FLOW ELEMENTS AND HAVING VERTICALLY EXTENDING AIR-FLOW PASSAGEWAYS THROUGH THE CENTRAL PORTIONS THEREOF, EACH OF SAID MODULAR AREAS ADJACENT ONE OF THE WALLS OF THE CEILED ROOM BEING DEFINED BY STRUCTURE ADJACENT SUCH WALL AND AT LEAST TWO OF SAID ELONGATED ELEMENTS AT LEAST ONE OF WHICH IS AN AIR-FLOW ELEMENT AND EACH OF SAID MODULAR AREAS REMOTE FROM SUCH WALLS BEING DEFINED BY AT LEAST THREE OF SAID ELONGATED ELEMENTS AT LEAST TWO OF WHICH ARE AIR-FLOW ELEMENTS, AT LEAST ONE OF SAID AIR-FLOW ELEMENTS DEFINING EACH OF SAID MODULES HAVING A CONTINUOUS AIR DUCT EXTENDING THEREALONG ABOVE THE LEVEL OF SAID FLANGES AND COMMUNICATING ALONG ITS LENGTH WITH THE VERTICAL PASSAGEWAY IN THE ASSOCIATED AIRFLOW ELEMENT FOR THE FLOW OF AIR BETWEEN THE SPACE BELOW SAID CEILING STRUCTURE AND SAID AIR DUCT, (2) ADDITIONAL ELONGATED, INVERTED, T-SHAPED ELEMENTS EXTENDING BETWEEN AND GENERALLY TRANSVERSE TO SAID MODULE DEFINING ELEMENTS FOR COOPERATION THEREWITH IN SUPPORTING CEILING PANEL BOARDS, LIGHT FIXTURES AND THE LIKE WITHIN EACH OF SAID MODULES, AND (3) RETAINING MEANS FOR CONNECTING SAID ELONGATED ELEMENTS TO EACH OTHER.