UL 181 Listing
Ductwork fabricated from The PalDuct Phenolic System is UL listed as a Class 1 Air Duct, to Standard for Safety UL 181 (Underwriters Laboratories: Factory Made Air Ducts & Air Connectors), when fabricated to a specification clearly defined by UL.
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Online Certifications Directory
Online Certifications Directory The Online Certifications Directory includes the names of companies authorized to use the UL Mark on or in connection with products in compliance with UL’s requirements. If you wish to view that a product is UL Listed, then either use the web address www.ul.com and the Online Certifications Directory tab searching for a company name e.g. Pal or UL file number, alternatively type in the link below or search company name e.g. ‘Pal’.