The DFC Model 815 Electric Assay Furnace is designed for assaying of ores and has a capacity of 28 twenty gram crucibles. Thousands of these furnaces are in use throughout the world in assay labs today. They feature Proportional Temperature Controller, Tyke K, Automatic or manual 7 day timer control, high density alumina vibrocast refractory lining, silicon carbide semi-muffle hearth plate, fixed input voltage for either single phase of three phase current supply, integral exhaust blower to vent both the interior and the door hood, swing away plug style door with refractory shell covered with high density alumina, butterfly type damper in blower for infinite air flow control, no power transformer, unit uses direct supply voltage through zero crossover power unit and these furnaces use lightweight ceramic fiber insulation module system which gives easy access to lining tiles.