Circulation air distribution system

In a floor structure having a floor upper surface and comprising a metal subfloor supporting an overlying layer of concrete, the combination comprising:

• said metal subfloor including at least one cellular metal flooring unit presenting spaced-apart first and second cells having a lengthwise trough therebetween, said first and second cells having confronting generally vertical webs, and first and second cell outlet openings in said first and second cells;
• a first source of air supplying said first cell with air at a first temperature;
• a second source of air supplying said second cell with air at a second temperature;
• enclosure means enclosing a portion of said lengthwise trough including said first and second cell outlet openings, and having a central outlet opening proximate to said floor upper surface;
• diffuser means at said central outlet opening and substantially flush with said floor upper surface for directing air discharged from said enclosure means into the space above said floor structure;
• and
• valve means within said enclosure means for controlling the amount of air being discharged from said first and second cell outlet openings through said diffuser means to the space above said floor structure.

In a floor structure having a floor upper surface, a space above said floor upper surface, and comprising a metal subfloor supporting an overlying layer of concrete, the combination comprising:

• said metal subfloor including at least one cellular metal flooring unit presenting spaced-apart first and second cells having a trough therebetween, said first and second cells having confronting generally vertical webs, and sets of first and second cell outlet openings uniformly spaced along the length of said first and second cells;
• a first source of air supplying said first cell with air at a first temperature;
• a second source of air supplying said second cell with air at a second temperature;
• control means, one for each said set, for controlling the volume and the temperature of air being discharged from said first and second cell outlet openings to said space above said floor structure, each said control means having control elements substantially flush with and operable from said floor upper surface.