| 摘要 |
<p>In a building having a heating, ventilation and air conditioning system, exterior walls and at least one story having a true ceiling, a suspended ceiling, and lighting fixtures occupying openings in the suspended ceiling, the true and suspended ceilings being vertically spaced thereby to form a plenum, the improvement is provided comprising means partitioning the plenum into an interior plenum forming a return air plenum for the system and at least one perimeter plenum, the exterior walls forming the periphery of the at least one perimeter plenum and the at least one perimeter plenum surrounding the return air plenum. In another embodiment, the improvement comprises thermally insulating material forming an interior area of the suspended ceiling and relatively thermally transmissive material forming a perimeter area of the suspended ceiling, the exterior walls forming the periphery of said perimeter area and said perimeter area surrounding the interior area.</p> |
