The Thermo Scientific explosion-proof freezer model 3552-A is engineered to prevent triggering an explosion inside or outside the unit. Offering -20 to -12 degree C temperature range, this 120 volt upright freezer features thermostat and compressor components safely housed within a vapor-proof enclosure. The 20.6 cu. ft. space is surrounded by a spark-free 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.