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 American National Standards Institute (ANSI), 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.