Keystone is a National Fenestration Rating Council (NFRC) licensed Inspection Agency (IA). The NFRC Certification Program offers fenestration (window and door) manufacturers a third party verified, nationally-recognized method for demonstrating product U Factor and Solar Heat Gain Coefficient (SHGC) as required by IRC Chapter 11 "Energy Efficiency".
The Keystone Structural and Impact Performance Certification Program is accredited by the ANSI National Accreditation Board (ANAB), and offers fenestration product manufacturers a third party verified, nationally-recognized method for demonstrating window, door, and skylight design pressure and resistance to flying debris resulting from hurricanes as required by IRC Chapter Chapter 6 "Wall Construction".
The Keystone Quality Assurance Program is accredited by the ANSI National Accreditation Board (ANAB), is officially recognized by the Florida Department of Business and Professional Regulation (DBPR) for demonstrating compliance with the third-party quality assurance requirements of the Florida State Product Approval Rule 9N-3 and ICC Evaluation Reports.