Melbourne’s climate demands flexibility from a window system. Safetyline louvres allow up to 86% free airflow in summer for rapid heat purging, while closing to air infiltration of just 0.03–0.12 L/s·m² in winter, comparable to a fixed-pane window. This combination of high airflow and low leakage supports NCC Section J compliance for Melbourne residential and commercial projects. For thermally broken frame and vacuum glazing U-value options, see FAQ 4.