Direct-Temp Multi-Fuel converts any conventional biomass appliance into a Direct Vent system. This unique venting system is designed to withstand the corrosive flue gases obtained when burning bio-fuels. The all-stainless steel construction features an inner liner of superferritic Stainless Steel. A leak-proof connection is achieved with built-in silicone gaskets. The concentric design saves installation time by combining flue exhaust and combustion air intake. Provides maximum safety, longer product life, enhanced performance and value.