When replacing windows or installing new windows, a rule of thumb is the higher the wind and water performance required, the shorter the louvre blade should be. In cyclonic regions the bay widths may be a maximum of 600mm or in other geographic areas with lower wind loads they may extend up to 900mm. The window frame can then be designed with multiple bays to achieve the desired frame width. With Breezway’s framing systems this can be up to 4 metres wide. Your window manufacturer will advise you based on your specific circumstances.