Model 3552-1A from Thermo Scientific is engineered to prevent triggering an explosion inside or outside the unit. Featuring -20 to -12 degree C temperature range, this 240 volt explosion-proof upright freezer has thermostat and compressor components safely housed within a vapor-proof enclosure. The 20.6 cu. ft. space is protected by a tough white enameled steel exterior and single solid door with built-in key lock. The electrical connections are hardwired to prevent sparking and accidental disconnection. This UL listed freezer meets OSHA and National Fire Protection Association safety requirements, and is suitable for use in Class I, Division I Group C and D hazardous environments.