PHOTOGRAPH 871
MODEL HD-304830 GAS HEATED BOX FURNACE, Serial No. 700037
for heat treating and high temperature testing

-maximum operating temperature: 2000°F
-workspace dimensions: 30" wide x 48" deep x 30" high
-650,000 BTU/HR installed in three (3) modulating natural gas burners with floor mounted combustion air blower
-7" thick insulated walls comprised of 5" of 2300°F ceramic fiber and 2" of 1700°F block insulation; 61/2 " floor insulation comprised of 41/2 " of 2300°F firebrick and 2" of 1900°F block insulation
-firebrick plate hearth supported by firebrick piers
-electrically operated vertical lift door
-Partlow MRC 7000 recording and programing temperature controller