Abstract: The present invention is intended for use in large conditioned air plenum environments and particularly in the plenum environment of multilevel raised floor electro-mechanical distribution systems. The invention comprises the step of providing at least one height change of dedicated conditioned air plenum, which alters the plenum's volume. This makes it possible to maintain the preferred static pressure and velocity for conditioned air throughout the entire plenum even as the amount of air in the plenum decreases as conditioned air discharges into the intended space outside of the plenum.

Abstract: The subject invention is directed to an improved modular multilevel raised floor electro-mechanical distribution system for installation in building structures including, but not limited to, data centers and similar rooms having high heat loads requiring usually dedicated cooling systems and usually having extensive data cabling and wiring. In addition to a walking and equipment support surface, the invention provides dedicated levels, isolated from one another and positioned under the walking surface, for distribution of electrical services, including data, on the one hand, and conditioned air, on the other.