In the Australian Standards As 3959, they have classified different bushfire intensity levels that a home may experience during a bushfire. These are referred to as Bushfire Attack Levels, or BAL’s for short.
There are 6 bushfire attack levels in total, these are;
BAL Flame Zone
BAL 40
BAL 29
BAL 19
BAL 12.5
BAL Low
These individual levels are based on;
The region where you live.
The vegetation type around your property.
The distance from your home to individual vegetation types.
Slope on the property.