Lacking modern energy-intensive lighting and space conditioning systems, nineteenth century industrial architecture in America made good use of available solar resources, using multistory structures with large windows and ridge vents designed for solar-driven lighting and ventilation. In the early 1900’s, the single story factory with a saw-tooth roof became the most prevalent architectural form for manufacturing and assembly plants. The single story layout allowed for assembly lines to snake through the building, and the saw-tooth roof, featuring north-facing, nearly vertical windows, provided diffuse natural light and ventilation to the workspace. This changed in the early 1940’s with the advent of lower cost fluorescent lighting and mechanical ventilation that led to today’s flat roofed, artificially lit, air conditioned commercial building space. SkyLouver allows both manufacturing and assembly operations using flat roof structures to take advantage of today’s less expensive solar daylighting and energy.