This supporting bracket set, enables a 100mm x 100mm duct system to be installed in the aisle, below the overhead superstructure, in front of the racks to be serviced. It is typically used when the existing overhead ducting has reached its carrying capacity for optical fibre cords. One side of the duct is cut down some 23mm to enable easy installation of optical fibre cords. The bracket is supported from overhead Unistrut steel members. All necessary bolts, washers and nuts are provided. Comes with a 300mm length of plastic edging for rack top cable opening.