What is UL (Underwriter's Laboratories) certification?

UL is an abbreviation for a safety certification testing institute established in 1894 by the American Insurance Association.
For 120 years, we have developed world-class safety standards and safety-related devices,
We are a company specializing in safety science that conducts testing and research on systems or materials.
The main purpose of certification is to investigate risks affecting human life and property.
UL site inspectors around the world visit manufacturers in person to ensure that the UL quality mark is applied.
Ensure products meet applicable UL safety requirements

Acquired from Kingspan
UL181 is Standard for Factory-Made Air Ducts and Air Connectors
Certification of part of "Factory Made Duct and Air Connector Standard"