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UL Standard | UL 181 | Edition 11 | Factory-Made Air Ducts and Air Connectors | Edition Date: July 25, 2013 | ANSI Approved: December 29, 2021. Complete Document. UL Standard for Safety Factory-Made Air Ducts and Air Connectors. Includes all amendments and changes through Revision UL Standard 181B - Closure Systems for Use With Flexible Air Ducts and Air Connectors. UL Standard 723 - Tests for Surface Burning Characteristics ofATCO's UPC #087 is a UL 181, Class 1. Air Duct and is manufactured with a reinforced durable black polyethylene jacket. The UPC #087 inner core is air-tight This far surpasses the fifty percent margin required in most installations. UL 181 Tests for Structural Integrity. Puncture Test. Static Load Test. Pressure and. Description Features and. ATCO's UPC #017 is a UL 181, Class 0 Air Duct Benefits which meets the requirements of NFPA (9OA & 90B)