Heat Transfer In Window Frames With Internal Air Cavitiesis Examined In This Postulation. Examinations Concentrate on Two- Andthree-Dimensional Natural Convection Impacts Inside Air Cavities, Thedependence of the Emissivity on the Thermal Transmittance. Furthermore Theemissivity of Anodized and Untreated Aluminium Profiles. the Examinations Arebasically Led on Window Frames Which Are the Same Measure As Genuine Framesdiscovered In Residential Buildings.