A screening device is provided with multiple channel upper and lower panel retaining members that allow multiple panels to be laterally moved past each other. Channel end caps, a panel rolling member assembly and close spacing of the upper and lower panel retaining members prevent removal of the panels from the screening device. A support structure uses angled castings and extrusion members for rapid custom screen device assembly that avoids long welding assembly times as well as subsequent weld failure due to screen device vibration. The panel rolling member assembly uses balls, rollers or wheels to easily move the panels in their channels. A trim member with oppositely faced channels engages upper and lower projections on the panel retaining members and covers fastener heads located in a recess in the panel retaining members.