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REFERENCES: http://www.capral.com.au/urban-580-sliding-window http://advancedmetalcladding.com.au/materials/ https://www.sapphirealuminium.com.au/selecting-coating-thickness.html https://www.customaluminiumwa.com.au/products/t-bar-extrusion/ https://www.doric.com.au/product/dh30 https://www.bunnings.com.au/70-x-35mm-5-4m-h3-f7-treatedpine_p8422945 http://www.proctorgroup.com.au/thermalcheck/ http://www.inoutic.de/en/tips-on-window-purchase/saving-energy/u-valuefor-windows/