Introduction Combustion Process Topography Fire Regime Fuels Fuel Characteristics Fuel Loading Prescribed Burns Remote Sensing Exercises GeoSTAC

Fuels

National Fire Danger Rating System (NFDRS)
has classified fuels into four broad groups:

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Light (grasses, forbs, sawgrasses, and tundra)

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Fuel models A, C, L, N, S, and T

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Medium (light brush and small trees)

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Fuel models D, E, F, H, P, Q, and U

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Heavy (dense brush, timber, and hardwoods)

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Fuel models B, G, and O

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Slash (timber harvesting residue)

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Fuel models J, K, and L

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For a better understanding, see Gaining a Basic Understanding of NFDRS (2002); A Self Study Reading Course of contact National Interagency Fire Center for NFES 1574, Aids to Determining Fuel Models For Fire Behavior