Established for more than 40 years, the underfloor Duct System is still a popular method of distribution for electrical services in poured-in-place concrete construction. The floors can be "one-pour" or "two-pour" type. Single, double and triple duct systems are available. Features of the Conduflor junction units are large modern square lids and passage of large telephone ducts (6 1/2" x 1 1/2") through the junction unit without impairment of cross sectional dimensions.