Abstract: A distribution duct for power distribution wiring, data communication wiring, and the other wiring is mounted between adjacent perforated support columns of a work space system. The duct extends laterally from the columns to allow the wiring to pass the face of a column. The duct includes an inner elongated member which rests at each end in a perforation in a respective column. A resilient clip holds each end of the inner member in the perforations. The inner member has an open side that is covered by an elongated outer member that is coextensive with the inner member and extends laterally away from one side of the columns. The outer member is snapped in place on the inner member, and covers snap in place on the outer members to connect the ends of adjacent outer members. An identical inner member may be mounted to the rear of a first inner member and receive a similar outer member to form a two-sided duct.