Clear Thermoclick Clerestory – 8mm Clear Solar Collector Below. – The 40mm Lexan Thermoclick Polycarbonate sheet and aluminum frame system can be used on a wide variety of clerestories, curtain walls, window walls, ribbon windows and a broad range of other creative polycarbonate daylighting projects. Thermoclick sheet is available in 40mm, 4.47 R-Value, polycarbonate for high insulation. The daylighting system includes a clear satin anodized aluminum framing system. The system approach results in swift installation, as the customer simply provides a rough frame opening, then attaches aluminum frame and inserts the Thermoclick Panels into the frame. This application is an office building clerestory project.