Manufactured by Lindberg these are top loading vacuum furnaces with a full swing cover with air operated lift. Model 22-GR-3830. Load volume 20 cubic feet, load capacity 2,000 pounds. Working diameter of 38” X 30” high. Backfill gas 140 cubic feet. Mechanical pump 150 CFM, Blower 850CFM. 30 hp cooling fan is powered by an external foot-mounted motor. Fan circulates inert gas through the workload and the internally mounted heat exchangers at pressures up to 2 PSI. Vertical graphite heating elements. Hot zone consists of low density, lightweight fiber insulation wounded on a steel module. Operating temperature of 1700F. Approximate shipping weight of 14,000 pounds. All units built between early 1990 and 1998. Installed but removed from service earlier this year. Best offer.