Abstract: A building construction comprising a plurality of spaced parallel structural beams supported on columns. Trusses extend between the beams and layers of roofing material are applied over the beams and the trusses to define a duct at each beam through which air can pass and in which utilities and other service lines are located.

Abstract: A building construction comprising at least one longitudinally extending beam, a plurality of spaced parallel beams extending transversely of and fastened to said longitudinally extending beam, and a plurality of panels extending between adjacent transverse beams in side-by-side relationship. Means are associated with at least one of the transverse beams and define a duct for the passage of air. The panels have openings therethrough communicating with the duct such that air passing through said duct may pass downwardly and inwardly to the interior of the building.