Dam Buster products are truly revolutionary, high performance devices; they have totally rewritten the book on box gutter roof drainage in Australia. They are the only informed, sensible choice for a building project of any size that requires box gutters.
Off-the-shelf, fully engineered Dam Buster products have been extensively tested by recognised industry experts and are all simply selected based on box gutter flow rates (in litres per second). Specific technical information can be found HERE.
Depending on the location of installation, Dam Buster products may be either Deemed to Satisfy or require a Performance Solution, but if the latter is required, all documentation you need under the National Construction Code is available free HERE.