The Door and Hardware Institute is a professional organization that serves as the resource for education and information on doors, hardware, security and specialty products for the architectural openings industry.
For over 100 years the Warnock Hersey Mark (WHI) has represented quality and integrity. Intertek helps you meet NFPA 80 requirements for fire doors, which gives you code compliance.
Underwriters Laboratories Inc. (UL) is an independent, not-for-profit product safety testing and certification organization. We have tested products for public safety for more than a century. Each year, more than 16 billion UL Marks are applied to products worldwide.
The Steel Door Institute is a voluntary, unincorporated, non-profit business association formed to promote the use of steel doors and frames in the construction industry.
The National Association of Architectural Metal Manufacturers (NAAMM) is the trade association representing manufacturers of a wide range of metal products used chiefly in commercial and industrial building construction, particularly hollow metal doors and frames.