Intertek's Warnock Hersey Mark is a mark certifying product safety and performance used in North America, including on wood fire-rated doors. Intertek is a company that ensures products meet safety, health, environmental and quality standards for almost any product.
If a product has the Warnock Hersey Mark, it means the product is in compliance with building codes and other safety, health and quality regulations. More than 6,500 products bear the Warnock Hersey Mark, including fire doors, plumbing, hearth, hardware and construction products. If a product bears the mark, it indicates not only product safety, performance and quality, but also ensures ongoing compliance takes place at the manufacturing site. Testing and certification services include fire testing, weathering testing, structural testing and performance testing.