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Fuels

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


Light (grasses, forbs, sawgrasses, and tundra)

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


Medium (light brush and small trees)

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


Heavy (dense brush, timber, and hardwoods)

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Fuel models B, G, and O


Slash (timber harvesting residue)

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Fuel models J, K, and L


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