Metal Manufacturing Industries is the premier Hollow Metal Doors and Frames manufacturer in the mexican market; MMI exports certified fire doors and frames made in Mexico to North, Central and South America. All products are made at the first Hollow Metal Door and Frame manufacturing plant in Mexico based on Steel Door Institute (SDI) & National Association for Architectural Metal Manufacturers (NAAMM) production standards, with certifications by UL, WH and Factory Mutual. Members of the Door and Hardware Institute (DHI) and the United States Green Building Council (USGBC).