NUOENWEI Clamped High Temperature Duct | Single-Layer Iron Clamp Fabric Duct

What Is a NUOENWEI Clamped High Temperature Duct?

A NUOENWEI clamped high temperature duct is an iron clamp fabric duct built to convey hot air through industrial heating systems, portable heater outlets, and high-temperature exhaust lines. Unlike standard flexible ducting that relies on tape or friction-fit connections, this duct uses a reinforced iron clamp structure that keeps the fabric wall firmly in place at the connection point — preventing the duct from collapsing, slipping off the heater outlet, or leaking at joints under thermal stress.

The duct is available in single-layer and multi-layer constructions. The single-layer version described here is built to customer specification — it keeps the duct lightweight and flexible while handling continuous temperatures from -40°C to 300°C. If your application requires additional insulation, abrasion resistance, or a different thermal profile, NUOENWEI can also manufacture multi-layer high-temperature ducts. Please contact us with your requirements.

How the NUOENWEI Clamped High Temperature Duct Is Built

The construction of this duct is straightforward by design. The wall is made from high-temperature-resistant fabric. The connection ends are reinforced with an iron clamp structure — a rigid metal profile that mechanically captures the fabric wall and holds it in a circular shape.

That clamp structure is what makes the difference in real-world use. When a portable heater runs at 250°C and the duct is under vibration, the iron clamp keeps the duct seated on the heater outlet. When the duct is used in exhaust mode under negative pressure, the clamp prevents the fabric wall from collapsing inward. In both cases, the duct maintains its shape and connection integrity where a standard fabric duct would struggle.

For the single-layer version, there is no internal insulation barrier between the hot air stream and the duct wall. This keeps the duct lightweight and highly flexible, and it delivers warm air directly to the target area. For applications that need better heat retention or added durability, NUOENWEI offers multi-layer construction as an alternative.

Key Specifications

NUOENWEI manufactures this duct in inner diameters from 200mm to 800mm. Length is fully customizable, so the duct can be cut to match the exact distance between your heater outlet and the delivery point. Custom diameters, lengths, colors, and branding are available for OEM and distribution projects.

What Makes This Duct Different

Iron Clamp Instead of Tape or Friction

Most flexible ducts are held in place by tape, zip ties, or a friction-fit sleeve. At 300°C, tape adhesives degrade and slip. Friction-fit connections loosen under vibration. The iron clamp on the NUOENWEI duct is a mechanical lock — it does not depend on adhesive or friction to stay seated. This means fewer leaks, less downtime, and a safer connection at the heater outlet.

Continuous -40°C to 300°C Rating

The duct is rated for continuous operation from -40°C to 300°C. This covers the output range of indirect-fired construction heaters, industrial oven exhaust, and most portable heater applications. The fabric wall is selected for thermal stability in this range — it does not harden, crack, or discolor under normal operating conditions.

Single-Layer or Multi-Layer, Built to Your Requirement

The single-layer configuration is the version specified by our customer for this product listing. It keeps the duct lightweight and highly flexible. If your project requires additional insulation, higher abrasion resistance, or a different thermal profile, NUOENWEI can manufacture a multi-layer high-temperature duct instead. Both constructions use the same iron clamp connection principle.

Efficient Warm Air Transfer

The duct is designed specifically for moving warm air. The smooth inner wall minimizes pressure drop, so the heater does not have to work as hard to push air through the duct. The result is consistent airflow and efficient delivery of heated air to the target area.

Where This Duct Is Used

Portable Heater Ducting on Construction Sites

Indirect-fired diesel and gas heaters used for winter construction produce air streams that can exceed 250°C. The NUOENWEI clamped high temperature duct routes that hot air into enclosed work areas, curing tents, or ground-thawing zones. The iron clamp keeps the duct seated on the heater outlet even when the heater is moved or repositioned during the day.

Industrial Oven Exhaust

Curing ovens, drying ovens, and paint bake ovens generate hot exhaust that must be vented. The NUOENWEI duct can be used to route exhaust from the oven port to a wall or roof penetration. The 300°C rating covers most medium-temperature oven exhaust applications, and the iron clamp provides a secure connection at the oven outlet.

Temporary Building Heating

When a warehouse, workshop, or event space needs rapid heating, portable heaters connected to flexible ducting are the fastest solution. The NUOENWEI duct distributes warm air efficiently and can be quickly deployed, repositioned, or removed as the heating requirement changes.

Ground Thawing and Frost Protection

In cold-climate construction, ground thawing before excavation or concrete pouring is a common requirement. Portable heaters connected to high-temperature ducts distribute heat across frozen ground. The duct's flexibility allows the heating line to be routed around site obstacles without custom fabrication.

How to Choose the Right Size

Two factors matter most when selecting a NUOENWEI clamped high temperature duct: diameter and length.

Diameter determines airflow capacity. The duct is available in inner diameters from 200mm to 800mm. A larger diameter moves more air volume at lower velocity, which reduces pressure drop and heater strain. A smaller diameter increases velocity but also increases back pressure. For most portable heater applications, a diameter that matches the heater outlet is the starting point — sizing up one step can improve airflow if the duct run is long.

Length affects heat loss. The longer the duct, the more heat is lost to the surrounding environment before the air reaches the delivery point. If the duct run is long, consider whether a single-layer duct is the right choice or whether a multi-layer configuration would better retain heat. The duct is fully customizable in length, so it can be cut to the exact run required — no excess duct left coiled on the floor.

Maintenance and Handling

The NUOENWEI clamped high temperature duct is designed for repeated use. To get the longest service life:

• Inspect the fabric wall after each high-temperature cycle. Look for hardening, cracking, or discoloration near the clamp ends. These are early signs that the fabric is reaching the end of its thermal life.

• Avoid sharp bends and kinks at the same point. Repeated kinking in one location creates a stress concentration that can tear the fabric over time.

• Check the iron clamp tightness periodically. Vibration from portable heaters can loosen band clamps. A quick check before each use prevents the duct from slipping off mid-operation.

• Store the duct compressed in a dry area. Prolonged exposure to direct sunlight degrades the fabric over time. When not in use, collapse the duct and store it away from sharp objects.

Frequently Asked Questions

Q: What is the maximum continuous temperature for this duct?

The NUOENWEI clamped high temperature duct is rated for continuous operation from -40°C to +300°C. For applications that require higher temperatures, please contact NUOENWEI to discuss whether a different product configuration is available.

Q: Can I order a custom diameter or length?

Yes. The duct is available in inner diameters from 200mm to 800mm, and length is fully customizable. For custom diameters outside this range, contact NUOENWEI directly.

Q: What does “clamped” mean on this duct?

“Clamped” refers to the iron clamp structure at the connection ends. It is a mechanical reinforcement that holds the fabric wall in shape and provides a secure, rigid connection point. It is not a separate hose clamp added after manufacturing — it is part of the duct construction.

Q: Is this duct suitable for exhaust (negative pressure) applications?

Yes. The iron clamp helps maintain the duct’s circular shape under negative pressure, reducing the risk of collapse compared to an unreinforced fabric duct.

Q: Can you make a multi-layer version?

Yes. The single-layer version shown here is built to customer specification. NUOENWEI can also manufacture multi-layer high-temperature ducts for applications requiring additional insulation, abrasion resistance, or a different thermal profile. Please contact us with your requirements.

Q: How do I connect the duct to my heater?

Slide the clamp-reinforced end over the heater outlet and secure it with a band clamp or worm-drive clamp. The iron clamp provides the structural grip; the band clamp provides the sealing force.

Q: Can this duct be used outdoors?

Yes. The duct is suitable for both indoor and outdoor use. For extended outdoor installations, inspect the fabric periodically and store the duct under cover when not in use.

Q: Do you offer OEM or ODM services?

NUOENWEI supports OEM and ODM projects. Custom diameters, lengths, colors, and branding are available. Contact the sales team with your requirements.

NUOENWEI — Clamped High Temperature Duct
-40°C to 300°C | 200mm–800mm ID | Custom Lengths | Single-Layer Iron Clamp Fabric Duct | Multi-Layer Available