1. Concealed heavy duty self close mechanisim on self close models only. 2. Lead fusible Link on self close models. 3. 2" flame aresstor vents. 4. Flush mounted paddle handle. 5. 4" Heavy duty weld hinge with brass pin. 6. Ground connector. 7. Adjustable leveling feet on many models. 8. 2" leakproof sump for spill containment. 9. 16 gauge louvered shelf supports adjust on 2.5" centers. 10. 3 point locking system. 11. Rounded safety corners on doors. 12. Safety signage in large red lettering. 13. Heavy duty 14 gauge doors.