No. 989 is an electrically heated, 2000°F inert atmosphere furnace used to process fabricated parts. Workspace dimensions measure 30 inches wide x 48 inches deep x 30 inches high. The furnace features 7-inch-thick insulated walls (comprised of 5 inches of 2300°F ceramic fiber and 2 inches of 1700°F ceramic fiber) plus 7.5-inch floor insulation (comprised of 4.5 inches of 2300°F firebrick and 3 inches of 2300°F block insulation). Controls on No. 989 include an inert atmosphere flow meter and pressure regulator, digital programming temperature controller, manual reset excess temperature controller with separate contactors and a strip chart recorder. Info # 302