Twin City Hardware Company, Inc. is a recognized member of Intertek's Certified Machiners Program, allowing them to modify Intertek Certified Fire Doors and Frames as detailed within the applicable Intertek specification listings. Twin City Hardware Company, Inc.’s sites, located at 5670 South 40th St., Phoenix, AZ 85040 and 720 Hale Ave. N Oakdale, MN 55128, are subject to routine inspections to verify that modifications to Intertek Certified Fire Doors and Frames are done in compliance with the requirements of the Intertek specification listings.
