Metal safety cabinets, designed to store flammable liquids, chemicals, and hazardous materials, must meet specific requirements to ensure safety and compliance with regulations such as OSHA and NFPA. They should be constructed from high-quality, double-walled steel with at least 1.5 inches of air space between walls to reduce the risk of fire. Doors must be self-closing, self-latching, and equipped with a three-point lock system to prevent unauthorized access. The cabinets should also have a spill-containment sump on the bottom to catch leaks, venting options with flame arrestors, and be clearly labeled with the contents and hazard level. Additionally, they should be grounded to prevent static buildup and potential ignition.