What is the typical size of 100-hr fuels?

The typical size of 100-hour fuels ranges from 1 to 3 inches in diameter. This classification of fuels is part of a system that categorizes dead organic materials based on their size and the time it takes for them to respond to changes in moisture content.

100-hour fuels are larger than the smaller categories, like 1-hour and 10-hour fuels, which are less than 0.25 inches and range from 0.25 to 1 inch, respectively. Due to their size, 100-hour fuels take longer to dry out and, similarly, will retain moisture for longer periods compared to smaller fuels. This means that they can influence fire behavior differently. Their size makes them capable of carrying fire but at a slower rate than smaller fuels.

Understanding the characteristics of 100-hour fuels is essential for fire management and predicting fire behavior in various conditions.