Additional InformationBOCA Certified|NFPA 90A/90B|SBCC Approved|UL 181
Marketing InformationAtco 500 Series is a UL 181 Class 1 air connector which meets the requirements of NFPA (90A and 90B). 500 Series is manufactured with a tough double ply duct wall construction. 25 ft L, which can easily be cut to desired length, are compressed and packed in small, easy-to-store cartons. The 500 Series is air tight and is designed for low to medium operating pressures in HVAC systems.