The paper describes U.S. Environmental Protection Agency (EPA) Multifuel Combustor (MFC) facility at Research Triangle Part, NC, for conducting research into phenomena which control the formation and destruction of various pollutants from the combustion of non-conventional solid fuels. Also discussed are plans for performing biomass combustion tests. The MFC is large enough to simulate time/temperature histories and heat release rates of full-scale units, yet small enough to allow control over experimental conditions. Current plans are to use the MFC for conducting combustion tests with untreated wood (such as harvested wood and mill residue) and treated wood (such as construction and demolition wood and pallets). Emissions measured in Phase 2 will be compared with Phase 1 baseline emissions, thus providing insight into what degree, if any, treated wood emissions require additional control.