These cabinets store two 55 gal drums vertically. This all welded double wall cabinet features 12 ga exterior walls and 16 ga interior walls spaced 1-1/2 in apart. Air vents on each side of the cabinet allow ventilation. The manual closing double doors include the 3-point locking system. The 9 in catch pan under the floor of the cabinet catches spills. These cabinets are finished with a coat of safety yellow paint and can be converted to store 5 ga pails by purchasing shelves. It is manufactured to National Fire protection Association Flammable and Combustible Liquid code #30 to meet OSHA requirements.