Abstract: A multi-panel sliding closure unit having a plurality of slidable panels such as doors or insect screen panels are used to close a large opening in a building wall such as an opening facing out onto a patio or deck. Adjacent panels stand in edge-to-edge relationship but between adjacent panels is a vertical jamb post of H shaped cross-section into which the panels fit, holding them securely on their vertical edges. The jamb posts each fit snugly between a pair of upper and lower tracks that also hold the horizontal edge of the panels for sliding movement therealong. At one end of the tracks is a laterally movable storage module for storing panels slid therein from the tracks.