Ceiling duct structure

Claim 1

A CEILING DUCT STRUCTURE COMPRISING A DUCT OF SOUND-ABSORBING MATERIAL AND HAVING LOWER VERTICALLY DISPOSED PARALLEL SIDE WALL PORTIONS DEFINING A LOWER LONGITUDINAL AIR-PASSING THROAT, A LONGITUDINAL MEMBER ALONG THE BOTTOM OF AND ACROSS SAID THROAT, SAID MEMBER BEING PROVIDED WITH A BASE PLATE UPON WHICH SAID LOWER VERTICALLY DISPOSED SIDEWALL PORTIONS OF SAID DUCT ARE SUPPORTED, SAID BASE PLATE HAVING A PLURALITY OF AIR-PASSING OPENINGS THEREIN OPEN TO SAID THROAT, AND SAID BASE PLATE BEING PROVIDED ADJACENT SAID THROAT WITH VERTICALLY DISPOSED SIDE WALLS COOPERATING WITH SAID BASE PLATE TO FORM A DOWNWARDLY-FACING CHANNEL, SAID OPENINGS IN SAID BASE PLATE BEING SPACED INWARDLY FORM SAID SIDE WALLS, SAID SIDE WALLS PORTIONS OF THE DUCT MAKING SEALING ENGAGEMENT WITH SAID BASE PLATE AND SAID VERTICALLY DISPOSED SIDE WALLS ABOVE SAID BASE PLATE, THE LOWER EDGES OF SAID SIDE WALLS BEING PROVIDED BELOW SAID BASE PLATE WITH OUT-TURNED FLANGES FOR FRAMING CEILING PANELS, AND HANGER MEANS CONNECTED TO SAID BASE PLATE EXTENDING UPWARDLY THROUGH THE DUCT TO SUPPORT SAID BASE PLATE AND THE DUCT FROM ABOVE.