Fire growth rates are classified as slow, moderate, fast or ultra fast. Fires generaly have an exponential growth rate and the classification represents various times between flaming ignition and a fire delivering 1 MW of heat.
75 sec Ultra Fast
150 sec Fast
300 sec Moderate
600 sec Slow
moderate fire
1.4
front
Around the ring of fire and maybe hawaii
front
fire
fire
Class 4/9
HD 1.4. Note, HD1.3 is not correct
Flame Spread 20 is a fire resistance rating given to materials that exhibit moderate flame spread. This means they have a moderate capacity to resist the spread of fire. A lower number indicates better fire resistance, while higher numbers indicate more rapid flame spread.
The squibs used in C-130 fire bottles are classified as explosive Class 1.4S. This classification is commonly used for pyrotechnic devices that are designed to ignite or cause an exothermic reaction.
There are four main wind classifications: calm, light, moderate, and strong. Each classification represents a different range of wind speeds.