The Fire and Fuels Extension (FFE) to the Forest Vegetation Simulator (FVS) integrates elements of existing fire behaviour and fire effects models (such as FIREMOD and FOFEM) with the ability of FVS to simulate tree growth and mortality and stand management.

The FFE can simulate actual or potential fire behaviour and effects, including fuel consumption, crowning, tree mortality and smoke production. The FFE can also account for and report on stand carbon stocks and fluxes, separately tracking living and dead biomass and carbon in above- and below-ground pools.

The FFE was created in cooperation with scientists and others from the USFS and has been linked to all western and most eastern FVS variants, using regional rules and parameter sets.