Winblok® precast concrete window surround, including pre-glazed aluminium Tophung projecting out Winvent®. Manufactured from aluminium extruded sections, which are natural anodised or epoxy powder coated finished. The handle is injection moulded in black. Weather seals are wool pile. The adjustable friction stays are in 304 stainless steel. Our Winvent® TopHung windows are compliant with both SANS 10400-XA (energy performance) and SANS 613 (air and water filtration/penetration).