These cabinets store 55-gallon drums vertically. This all-welded double wall cabinet features 12-gauge exterior walls and 16-gauge interior walls spaced 1 1/2" apart. Air vents on each side of the cabinet allow ventilation. The manual closing double doors include the 3-point locking system. The 9" 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-gallon pails by purchasing shelves. It is manufactured to National Fire Protection Association Flammable and Combustible Liquid Code #30 to meet OSHA requirements.