Abstract: At least some aspects of the present disclosure feature a modular distribution system including a plurality of ducts connected in sequence and an attachment device configured to attach two adjacent ducts. At least one of the plurality of ducts includes a longitude axis, a plurality of coated panels, a plurality of rails disposed parallel to the longitude axis, each of the plurality of rails configured to receive the coated panels, and an end frame disposed generally perpendicular to the longitude axis and proximate one of the two ends of a coated panel.