Warnock Hersey Mark

The Warnock Hersey (WH-ETL) Mark is North America’s leading product safety and performance mark for building and construction products.

Products bearing the Warnock Hersey (WH-ETL) Mark indicate compliance to relevant building codes, association criteria, and product safety and performance standards. Nearly 80% of North America's wood fire-rated doors bear the WH Mark.

Intertek’s Warnock Hersey Mark has long been a marquee mark in building product industry and in 2013, Intertek introduced the next evolution of the Warnock Hersey mark. The new mark combined the storied ETL Mark with the traditional Warnock Hersey (WH) Mark. Combining two marks into one leveraged the fire-safety strength of the WH Mark with the electrical-safety strength of the ETL Mark allowing for easy recognition by Authorities Having Jurisdiction (AHJs) across North America. The new WH-ETL Mark provides customers whose products traditionally bore the WH Mark a solution that moves with the direction of their industry. If you have any questions about the new mark, be sure to check out our WH-ETL FAQ page.

The Warnock Hersey Mark can be found on more than 6,500 products ranging from fire doors, hardware, hearth, plumbing, and construction products. Utilizing the Warnock Hersey Mark on a product reflects a commitment to product safety, performance, and quality to inspectors, builders and end users. The mark also signifies that the product’s manufacturing site(s) undergo periodic follow-up inspections to ensure ongoing compliance of the originally certified product.

Our testing and certification services include:

  • Fire Testing
  • Field Labeling of Fire Doors
  • Physical Property Testing
  • Fenestration Testing
  • Weathering Testing
  • Structural Testing
  • Performance Testing

Testing Standards for the Warnock Hersey Mark
We test your products to applicable ANSI, UL, ASTM, CCMC, CSA, EPA, ICBO, and ULC standards.

Intertek is an OSHA (Occupational Safety & Health Administration) recognized NRTL (Nationally Recognized Testing Laboratory) in the U.S. and accredited as a Testing Organization and Certification Body by the Standards Council of Canada. We are also accredited by the International Accreditation Service (IAS), an International Code Council company.

  • Building Products Environmental Certification Program
  • CE Mark
  • ISMA Testing and Certification
  • Marine Products Testing
  • Miami-Dade County Testing

Need help or have a question?

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