Quietflex Flexible Foil Duct, Round, 4 Inch, 25 ft Length, R 8.0 Insulation
- Johns Manville Formaldehyde-free fiber glass insulation
- Galvanized metal core reinforcing
- Oversized core to fit on collars and register boxes
- Flame spread: less than 25, smoke developed: less than 50
- Class 1 rated duct assembly
- Weather-resistant packaging
- Greenguard® certified insulated products
Standard/Approvals: UL 181,HUD/FHA standards 515.2.1 and NFPA standards 90A and 90B
