Riddio Construction Co. Inc. dba Riddio Door 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. Riddio Construction & Supply, Inc.dba Riddio Door’s site, 2225 East Greg Street, Suite 105, Sparks NV 89431 is 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.