• 3” ferrule fitting threads into the end of a duct, using a patent-pending design to ensure a near air-tight seal to the duct. • Complies with Standard UL2043 and is identified as Classified with the ETL listed mark, control number 5016806. • Complies with Standard UL181C and is identified as Certified with the UL listing mark, file number MH64419 • PC/ABS UL94 V-0 • 10-01-010
