Description
Product Summary
QuietFlex part 780 is a 7-inch by 25-foot R-6 insulated flexible air duct from the QuietFlex 80 Series. It carries conditioned supply or return air between trunk lines, plenums and register boxes in residential and light commercial systems.
The 80 Series uses a metallic polyester with rip-stop scrim (silver) vapor-barrier jacket over fiberglass insulation and a steel wire helix core, and it is rated for indoor use.
Key Features
- R-6 insulation: reduces duct heat gain and loss and helps control condensation.
- 80 Series jacket: metallic polyester with rip-stop scrim (silver) protects the insulation.
- 25-foot length: covers long branch runs from a single bag.
- Steel wire helix core: holds the inner core open for consistent airflow.
- Fits standard collars: 7-inch size matches standard 7-inch collars, take-offs and register boxes.
Specifications
| Brand | QuietFlex |
|---|---|
| Model | 780 |
| Series | QuietFlex 80 Series |
| Inside Diameter | 7 in |
| Length | 25 ft |
| Insulation R-Value | R-6 |
| Jacket | Metallic polyester with rip-stop scrim (silver) |
| Application | Indoor |
| Core | Galvanized steel wire helix, oversized to fit collars |
| Insulation | Formaldehyde-free fiberglass |
| UL 181 Listing | Class 1 air duct |
| Operating Temperature | -20°F to 200°F |
Ideal Applications
- Attic and crawlspace branch runs
- New construction and replacement duct systems
- Connecting register boxes to trunk take-offs
- Light commercial supply and return branches
Frequently Asked Questions
What size collar does it fit?
It fits 7-inch round collars, take-offs and register box inlets. Secure it with approved tape or mastic and a duct strap.
What is the R-value?
It is insulated to R-6.
Can it be used outdoors?
This series is listed for indoor use. Choose a UV-rated or HUD-rated outdoor duct for exposed outdoor runs.
How long is each piece?
Each bag holds a 25-foot length that can be cut to size on site.
Why Buy From HVAC365
HVAC365 offers competitive pricing on QuietFlex flexible duct, fast shipping from stock, and support from HVAC specialists who work with contractors and property owners every day. Contact HVAC365 for sizing help, matching components or accessories before you order.
