The fixed axis rotary furnace is nothing more than a rotating tube with burner at one end and a flue at other. The furnace operates under negative pressure and draws cold air from outside thus making it virtually impossible to control the atmosphere of the furnace, which is nearly always oxidizing (air rich). This condition makes it necessary to use large amount of salt to protect the charge. The oil consumption is also high because travel length of flue gas is less. The UTRF furnace on the other hand is a closed chamber design having a single en-trance and exit point. The door carries the burner and the flue. The furnace operates under positive pressure and when the burner is firing there is a total absence of outside cold air therefore the furnace can operate with reduced amount of salt flux. Additionally the furnace operates at an angle, the charge is mixed with a similar action that of a concrete mixture. This improves homoge-neity and heat transfer resulting in a very high thermal efficienc