A U.S.-based manufacturer of microwave components needed precision heating to anneal parts before milling. To meet the heating demand, Lucifer Furnaces designed a small box furnace with a maximum temperature of 2300°F (1260°C).

The furnace includes an insulated chamber with a combined 5" hot-face insulating firebrick and cold-face mineral wool backup. The furnace also has a cast hearth plate to protect the floor insulation Coiled heating elements in cast assemblies provide the heat input and allow ease of replacement. 

Controls include a Honeywell digital time-proportioning temperature controller and a soak timer that starts when the furnace reaches setpoint temperature and shuts off the elements at the end of the heating cycle. A door safety switch automatically disengages power to the elements when the door opens.