The world s #1 manufacturer of glass door merchandisers. Factory engineered, self-contained, capillary tube system using environmentally friendly R290 hydro carbon refrigerant that has zero (0) ozone depletion potential (ODP), & three (3) global warming potential (GWP). Energy efficient, factory balanced, refrigeration system holds 33(degree)F to 38(degree)F (.5(degree)C to 3.3(degree)C). Exterior - non-peel or chip black powder coated cold rolled steel; durable and permanent. Interior - attractive, white aluminum interior liner with stainless steel floor. Self closing door. Positive seal, torsion type closure system. Low-E , double pane thermal insulated glass door assembly with extruded aluminum frame. The latest in energy efficient technology. LED interior lighting provides more even lighting throughout the cabinet. Safety shielded. Improved Health Safety Timer: Once the sensor in the cabinet senses that 41(degree)F (5(degree)C) has been exceeded for a continuous 30 minutes, the cabinet door will lock, the display will indicate HST LCK, and the LAE control will beep until silenced. (HST02 models only) Entire cabinet structure is foamed-in-place using a high density, polyurethane insulation that has zero ozone depletion potential (ODP) and zero global warming potential (GWP).