LL Building Products F6IFD4X300 Insulated Air Duct, 4" x 25'
- Metalized Jacket
- 25' Silver Jacket
- Diameter : 4"
- 2-ply inner core with smooth interior for more efficient air movement
- Durable, scuff resistant jacket. Zinc coated, high carbon steel wire helix
- 2" continuous blanket of glass fiber insulation
- R-Value 6.0