Designed using the highest quality materials and components to provide the user with colder product temperatures, lower utility costs and exceptional food safety. Factory engineered, self-contained, capillary tube system using environmentally friendly R290 hydrocarbon refrigerant that has zero (0) ozone depletion potential (ODP), & three (3) global warming potential (GWP). High capacity, factory balanced, refrigeration system holds 33(degree)F to 38(degree)F (.5(degree)C to 3.3(degree)C) for best food preservation in extreme conditions. Exterior - stainless steel doors and front, with matching aluminum sides. Interior - aluminum side walls and back. Stainless steel floor and ceiling. Glass full & half doors - Low-E , double pane thermal insulated glass. Solid door - Stainless steel (3) Heavy duty, PVC coated, wire shelves per section. Positive seal self-closing doors with 120(degree) stay open feature. Lifetime guaranteed door hinges. Lifetime guaranteed heavy duty all metal working door handles. Entire cabinet structure and solid doors are foamed-in-place using a high density, polyurethane insulation that has zero ozone depletion potential (ODP) and zero global warming potential (GWP).