Victoreen Annealing Oven used by the State of Colorado. Purpose: Annealing ovens are industrial furnaces used to heat materials—most commonly metal or glass—to a specific temperature and then slowly cool them to alter their physical properties, such as increasing ductility and reducing hardness. Features: The unit features a simple "OFF/ON" toggle switch and a prominent cooling vent (heat sink) on the front panel. Asset Tracking: It is marked with a State of Colorado identification number (007967) and associated with Vocational Education.