Thermal Dynamix builds box furnaces in several "standard" configurations and can also build to specific custom requirements.
Shown here is a model EBF343. This furnace electrically heated and has a load chamber measuring 36" wide X 48" deep X 36" high. It is a gas tight furnace set up to accept a 1000 lb load in an endothermic gas atmosphere.
Thermal Dynamix has a library of standard designs to accommodate load envelopes of up to 5'X 5' X 5' and load weights of 3000 lbs. All are very well insulated and designed to be thermally efficient.