Aspekt+ 1800 features a strength-enhancing sash in the company’s RAU-FIPRO glass-fiber reinforced polyvinyl chloride material. The new Aspekt+ 1800, an addition to the Aspekt 1800 casement window portfolio, is designed to meet stringent Passive House requirements and address the growing demand for larger windows in residential and commercial construction, according to company officials. Its co-extruded triple-seal technology limits thermal conduction and ensures a tight frame-to-sash seal with a significantly reduced U-value. An outswing casement window, Aspekt+ 1800 is available in a wide range of colors.