Fabric Duct Retention & Suspension Systems
Maintain duct shape, improve airflow consistency and support reliable performance in standard HVAC system layouts that are straightforward and full tensioning is not required. From internal structure systems to basic suspension options, choose the right level of retention or support for your project.
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Retention Systems
Retention systems improve duct stability and shape by adding structure to the system, reducing sag, minimizing movement and delivering more consistent airflow performance.
Internal Hoop System (IHS)
The DuctSox Internal Hoop System (IHS) is the most complete retention solution within standard fabric duct retention systems.
Key Benefits
- Improved shape retention – Internal hoops support the duct throughout the run, reducing sag compared to basic suspension systems.
- Minimal movement and noise – Stable during startup with little to no visible movement or “pop.”
- Consistent airflow performance – Maintains a more uniform airflow pattern across the system.
- Durable, proven design – Simple internal structure designed for long-term reliability.
Key Specs
- Diameter range up to ~60”
- Approx. 1–5% deflection
- Enhanced stability without needing full tensioning systems like SkeleCore.
Hanger Suspension Systems
Hanger systems use external supports to improve duct stability and reduce sag compared to basic cable suspension.
Key Benefits
- Improved stability over cable systems – External supports to maintain shape across the duct.
- Reduced sag – Better shape retention than standard cable configurations.
- Simple installation and maintenance – Straightforward setup with accessible components.
- Reliable mid-level performance – Practical option for projects needing more structure without internal frameworks.
Support Suspension Systems
These systems provide the most basic method of suspending fabric ductwork, offering a simple, cost-effective solution for standard applications.
Cable and Track Suspension Systems (1-, 2- and 3-Row)
Cable and track systems are the most common fabric duct suspension system method.
Key Benefits
- Simple, cost-effective design – Widely used across standard commercial applications.
- Flexible suspension options – Available in 1-row, 2-row and 3-row configurations.
- Easy installation – Lightweight HVAC fabric duct support systems that are quick to install.
- Adaptable to various layouts – Works well across a wide range of fabric air dispersion system duct configurations.
Considerations
- Greater sag and deflection compared to structured systems.
- More visible movement during startup.
Need More Than Retention?
Retention systems improve duct stability and appearance — but they still rely on partial support and airflow to maintain shape.
For applications requiring maximum stability, no sag and consistent performance regardless of airflow, SkeleCore® tensioning systems provide the next level of performance.
Others in the industry only achieve IHS-level solutions. Everything beyond
this point is exclusive to DuctSox SkeleCore®.
Need Help Choosing the Right System?
Our team can help you select the appropriate fabric duct sock suspension system or tensioning system for your application, airflow requirements and project goals.