Independently tested by CSIRO, Rylock Windows and Doors’ BAL C40 Series is a collection of certified windows and doors that meet the requirements of Australian Standard AS3959. Intended for the protection of property and assets in areas exposed to bushfires, such solutions are able to be specified when a site has a mandated BAL rating (up to and including BAL 40). architectureau.com/product-selector/bushfire-proof-windows-and-doors-bal-c40-series