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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.
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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.
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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.
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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.
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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.
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