| Flame Spread, -3; Smoke Development, -0 | Used To Trap and Seal Joints and Seams On Fibrous Duct Boards Hvac | UL Listed 6N28 181A-P | 7.2 Mil | Nashua 324A Tape - Manufacturer: Covalence Adhesives - Country of Manufacture: United States - Manufacturer Part Number: 652231.