SCREEN INTEGRATED COMMERCIAL RAIL: Screen integrated commercial rail, or SCR, is made to be a railing that can be screened, this way you can have a screen porch on multi story buildings. The railing is built on the same premise as the Standard Commercial Rail, only the top and bottom channel use a special extrusion with a screen groove. The uprights or posts are a snap and lock system that go from floor to ceiling and standard screen room open back finish off the opening so the entire opening can be screened. Please refer to the measuring and ordering page to determine which shutter best suits your individual needs.