A 1200°F electrically heated walk-in oven can be used for heat treating. Workspace dimensions measure 48 inches wide x 60 inches deep x 72 inches high. Incoloy-sheathed tubular elements heat the oven chamber, and a 12,500-CFM, 10-hp recirculating blower provides horizontal airflow to the workload. Controls include a manual reset excess temperature controller with separate contactors, recirculating airflow safety switch and a 10-inch-diameter circular chart recorder.