No. 857 is used for annealing plastics. Workspace dimensions of the electrically heated 500°F (260°C) walk-in oven are 7 x 12 x 7'. With 100 KW installed in Incoloy-sheathed tubular heating elements to heat the oven chamber, a 17,500 cfm, 15-hp recirculating blower provides horizontal airflow to the workload. The oven has 4" insulated walls and an aluminized steel interior and exterior. Both oven doors are equipped with drag seals, and wear bars installed on the sides of the workspace add durability. Controls onboard include a 975 cfm forced exhauster and motorized dampers on the intake and exhaust for accelerated oven chamber cooling.