Numerous duct assemblies are known in the prior art for enclosing conduits. However, these duct assemblies have several disadvantages. For example, many of them require many additional pieces to join a plurality of duct assemblies together. In addition, many of these prior art devices do not provide any means for attaching another duct assembly thereto in both the X and Y directions, i.e., side by side or one on top of the other. Moreover, many of these prior art duct assemblies are very expensive to make because they require numerous parts.
Examples of these prior art devices are disclosed in U.S. Pat. Nos. 3,693,664 to Schmunk; 3,727,644 to Kagan; 3,927,698 to Johannsen; 4,391,426 to Gothberg; 4,640,314 to Mock; 4,627,469 to Buard; and 4,720,768 to Schindele.