Abstract: A mounting arrangement for stretching mounting panels of flexible sheet material, disclosed as solar screening mesh, within openings such as window frames, including tensioner channel members secured to opposite edges of the screen panel, each tensioner channel being disclosed as an extrusion of identical cross-sectional shape and each including a recess within which is retained a retainer bar with the screen panel material passing around the retainer bar within the recess frictionally secured within the recess. A lip edge opposite the recess is formed on each tensioner channel, one of the tensioner channels lip edge hooked by rigid clip members fastened to the opening frame, while the other tensioner channel is resiliently supported to an opposing frame member by C-shaped spring clips secured to the window frame member.