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Each unit consists of a ceramic fiber heater mounted in a 2.5 inch (64 mm) deep sheet metal case that provides thermal insulation. The case includes post terminals for electrical connections and provides a mounting system that can be used with virtually any flat ceramic fiber unit, whether it is a stock, standard or a custom size. Since any of the flat unit heating element configurations can be used—exposed sinuated, embedded coil or foil elements— watt density and temperature capabilities can b