Product Overview
An R6 insulated flexible duct, 25 ft long, available in twelve diameters from 4 inch to 20 inch. It carries conditioned air from the trunk line to registers and returns, and the fiberglass insulation layer holds supply-air temperature while stopping condensation from forming on the outside of the duct where cold air meets warm, humid attic air.
Built from thickened aluminum foil over a fiberglass insulation layer, with a high-strength elastic steel spiral wire running through the core. It bends to any angle without a hard elbow, and the aluminum is self-sustaining — once you shape it, it stays put instead of springing back.
Pick Your Diameter
Use the selector above to choose the diameter that matches your run. All sizes are 25 ft long and R6 rated — only the diameter changes.
| Diameter | Length | R-Value | Best For | SKU |
|---|---|---|---|---|
| 4″ | 25 ft | R6 | Small branch runs / tight spaces | FLEX-4IN-25FT-R6 |
| 5″ | 25 ft | R6 | Small branch runs / tight spaces | FLEX-5IN-25FT-R6 |
| 6″ | 25 ft | R6 | Residential branch drops | FLEX-6IN-25FT-R6 |
| 7″ | 25 ft | R6 | Residential branch drops | FLEX-7IN-25FT-R6 |
| 8″ | 25 ft | R6 | Main trunk runs | FLEX-8IN-25FT-R6 |
| 9″ | 25 ft | R6 | Main trunk runs | FLEX-9IN-25FT-R6 |
| 10″ | 25 ft | R6 | Main trunk runs | FLEX-10IN-25FT-R6 |
| 12″ | 25 ft | R6 | Commercial / multi-zone trunks | FLEX-12IN-25FT-R6 |
| 14″ | 25 ft | R6 | Commercial / multi-zone trunks | FLEX-14IN-25FT-R6 |
| 16″ | 25 ft | R6 | Large commercial trunks | FLEX-16IN-25FT-R6 |
| 18″ | 25 ft | R6 | Large commercial trunks | FLEX-18IN-25FT-R6 |
| 20″ | 25 ft | R6 | Large commercial trunks | FLEX-20IN-25FT-R6 |
Specifications
| Type | Insulated Flexible Air Duct |
|---|---|
| Insulation Value | R6 |
| Length | 25 ft |
| Diameter Options | 4 inch, 5 inch, 6 inch, 7 inch, 8 inch, 9 inch, 10 inch, 12 inch, 14 inch, 16 inch, 18 inch, 20 inch |
| Inner Material | Flame-resistant aluminum foil |
| Insulation Layer | Fiberglass wool |
| Reinforcement | High-strength elastic steel spiral wire |
| Outer Jacket | Aluminum foil vapor barrier |
| Temperature Range | -4°F to 454°F (-20°C to 234°C) |
| Noise Reduction | Up to 85% |
| Resistance | High temperature, acid and alkali resistant, flame retardant |
| Application Pressure | High, medium and low pressure ventilation systems |
Key Features
- R6 insulation — holds supply-air temperature and prevents condensation and sweating in attics and crawlspaces
- Thickened aluminum foil — flame resistant, acid and alkali resistant, built for permanent installs
- Fiberglass wool insulation — high thermal resistance and corrosion resistance; the safest class of insulation material
- High-strength steel spiral wire — bends freely, self-sustaining, does not retract after installation
- Cuts noise by up to 85% — the lofted fiberglass structure absorbs sound as air moves through
- Keeps its shape — stays round and smooth, which lowers air resistance and static pressure loss
- No hard elbows needed — bends around joists, studs and existing services
- Ships compressed — full 25 ft pulls out of a compact box in seconds
- Twelve diameters — order the exact size your run needs
Applications
- Central air conditioning and HVAC supply and return systems
- Fresh air ventilation systems
- Mechanical equipment exhaust and recovery systems
- Trunk-to-register branch drops in attics, crawlspaces and between joists
- Any high, medium or low pressure ventilation run carrying non-corrosive gas
Installation Tips
- Pull the duct out to full 25 ft — a compressed run chokes airflow and raises static pressure
- Keep runs as straight and short as possible; every bend costs you CFM
- Support the duct every 4 ft with strap or hanger, and never let it sag between supports
- Slide the inner core over the fitting, then fold the insulation and jacket back over it
- Clamp the inner core and seal with mastic or foil tape — do not rely on the clamp alone
Note
Rated for ventilation systems carrying non-corrosive gas. Not for use with corrosive fumes.
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