Box Furnaces Standard Type Series Max. Temperature Economy Red Devil Box 2200°F General Purpose 7000 1850°F - 2300°F Heavy Duty 5000 2000°F - 2300°F Fiber Lined 7000 LI 2200°F Heavy Duty - Fiber Lined 5000 LI 2200°F High Temperature Type Series Max. Temperature Economy High Speed Steel EHS3 2450°F High Speed Steel HS3 2450°F High Temperature 3027 2500°F - 2750°F Heavy Duty - High Temperature 3029 2500°F - 2750°F Ultra High Temperature 6000 3100°F
