Cellular flooring system and method of using same

Claim 1

In a cellular flooring system of the type having a plurality of longitudinally extending parallel conduits provided on a first horizontal level, at least a portion of said conduits being formed by portions of corrugated metal decking sheets, and an overlying trench unit having a length and supported by said decking sheets on a second horizontal level disposed vertically above said first level, said trench unit having a plurality of adjacent parallel passageways crossing over and extending transversely with respect to said conduits and creating a region where the passageways and conduits are juxtaposed the improvement which comprises: (a) said trench unit having a base portion extending substantially the length of the trench with a generally rectangular opening therein extending substantially throughout the region where the passageways and conduits are juxtaposed to allow for communication and for substantially unrestricted vertical access between the passageways and conduits and; (b) separate isolating means in the form of a substantially flat plate member adapted to be positioned within the rectangular opening and to be removably attached to said trench unit in a substantially coplanar relationship with said base portion said isolating means having a shape whereby said isolating means partially covers said rectangular opening and acts as a complete isolating barrier between some, but not all, of the juxtaposed passageways and conduits and said isolating means provides at least one uncovered portion of said rectengular opening to allow for isolated access between at least one passageway and at least one conduit.