Auto Calculation of Fire Zone

[andydansby]

This is probably not useful to many people, but here's an excel spreadsheet

https://drive.google.com/file/d/0B8U1AO594Ex1TVc4ZjFzMFFXdDg/view?usp=sharing

To make quick calculations of firezones. It might be useful especially if you don't feel like doing the formula.

Andy Dansby