DERFLEX manufactures PVC coated fabric ducting and ventilation duct materials for buyers who need the duct body, reinforcement, connections and project specification to work as one system—not as unrelated components.
Configure the duct around pressure direction, fan interface, total run, bends, handling method, abrasion exposure and required test criteria. Final dimensions and performance values are confirmed in the approved product specification.
A flexible air duct looks simple after installation, but its reliability depends on several manufacturing decisions underneath the visible surface. The woven reinforcement must carry tensile stress without unnecessary stretch. The PVC coating must remain bonded to the textile during bending and welding. Seams must be compatible with the operating pressure. Hardware has to match the installation method, and a suction duct needs enough shape support to resist collapse.
This is why DERFLEX positions this product as a coordinated coated-textile assembly rather than a generic “PVC hose.” Buyers may source the PVC coated fabric as roll material for local conversion, or request a finished duct with welded body, reinforcement, suspension details and selected end connections.
A collapsible layflat construction is often practical because the duct is inflated by the forcing fan. It packs compactly for transport and can be extended as a work face advances. The procurement focus shifts toward seam integrity, joint leakage, handling length, suspension geometry and the fabric’s resistance to repeated flexing.
The duct body must retain a usable cross-section while air is being drawn through it. Spiral wire, steel rings or another shape-support strategy may be needed. Wire pitch, duct diameter, bend radius and external wear protection then become part of the engineering discussion rather than accessories chosen after the duct is made.
The performance of a PVC coated fabric duct is built in layers. DERFLEX can coordinate coated-textile production with downstream duct fabrication so buyers can define material and finished-product requirements in one project.
Polyester textile construction is selected for the required tensile, tear, flexibility and dimensional behavior.
Coating formulation and weight are matched to weldability, airtightness, abrasion exposure and operating environment.
Panels or continuous sections are prepared around required diameter, section length and fabrication geometry.
Welded body construction is planned around the confirmed coated fabric and pressure duty.
Helix wire, rings, suspension, wear strips, cuffs, zippers and other interfaces are added by configuration.
Dimensions, visual condition, fabrication details and requested material or project checkpoints are reviewed before shipment.
Two quotations can look similar while covering very different scopes. Clarifying the supply form first makes supplier comparison more meaningful.
For factories that already cut and weld flexible ducts locally and want control over their own hardware and assembly.
Collapsible ducting for forcing fresh air through tunnels, underground work zones, construction routes and temporary ventilation lines.
For extraction, suction, bends and portable equipment interfaces where the duct needs support against collapse.
These values are a quoting framework for common flexible ventilation products. They are not universal guarantees; the approved datasheet and project test requirements take precedence.
| Base construction | Woven or knitted polyester fabric with PVC coating on both sides; textile and formulation selected by application. |
|---|---|
| Typical fabric weight | Approx. 400–900 g/m2 for common flexible duct directions; other project grades can be discussed. |
| Duct diameter | Approx. 300–3000 mm reference range; final diameter should follow airflow, pressure, fan outlet and clearance review. |
| Section length | Approx. 1–100 m per section; practical length depends on diameter, handling, packing and connection plan. |
| Duct structure | Layflat positive-pressure, spiral wire-reinforced, ring-supported, portable blower duct or custom fabricated section. |
| Connection options | Steel ring, zipper, drawstring cuff, belt / strap concept or project-specific coupling. |
| Suspension | Eyelets, suspension fins, straps or custom attachment points depending on route and installation practice. |
| Color | Yellow, orange, black and custom colors subject to material and production confirmation. |
| Optional performance direction | Flame-retardant, antistatic, abrasion-focused, low-temperature or other formulations can be discussed against a named requirement. |
| Fabrication | Welding, cuff integration, wire reinforcement, connection hardware, suspension details, marking and packing by approved drawing/specification. |
The most expensive duct problem is often not the fabric price. It is choosing the wrong construction for the pressure duty, then paying for leakage, collapse, difficult handling or early replacement.
A manufacturer quote becomes more useful when it answers four questions: what keeps the duct open, what keeps air inside, what keeps sections connected, and what protects the duct during installation and use.
The same coated-textile platform can be fabricated into different duct types. The operating environment determines which structure, connection and surface options deserve attention.
Fresh-air supply and localized extraction for metro, railway, road, utility and water-conveyance tunnel work.
Review: run length, advancing face, suspension, bends, connection leakage.Auxiliary ventilation for headings, drifts, shafts and equipment zones where duct routes change with production.
Review: pressure duty, abrasion, flame/static criteria, coupling and repair strategy.Portable air delivery or extraction for tanks, vessels, utility work, maintenance zones and controlled-entry operations.
Review: blower outlet, portability, cuff format, section handling and exhaust route.Temporary intake, cooling, drying, dust or fume transfer during maintenance, shutdowns and equipment installation.
Review: air temperature, contaminant compatibility, bend radius and equipment interfaces.Temporary airflow for enclosed construction areas, curing, drying, cooling and general air movement.
Review: portability, quick connections, storage and repeated relocation.Private-label duct sections matched to portable fans, blowers, extraction units and distributor product ranges.
Review: repeat specification control, color, marking, packing and connection consistency.A low unit price is difficult to evaluate when suppliers are quoting different fabric structures, reinforcement systems or connection scopes. Procurement becomes clearer when the comparison sheet uses the same technical boundaries for every bidder.
DERFLEX combines coated-textile manufacturing experience with flexible duct fabrication support. That matters when a buyer needs the raw fabric and the finished assembly to be developed around the same project specification.
Coated textile can be reviewed for weight, surface condition, tensile/tear direction, adhesion and the properties named in the purchase specification.
Duct diameter, section length, seam construction, wire or ring reinforcement, suspension points and connection details can be checked as finished-product items.
Color, marking, packaging, hardware and agreed construction details can be organized for distributor or equipment-brand repeat orders.
You do not need a finished engineering drawing to start. A short set of operating and interface data usually gives the manufacturer enough context to recommend the next specification step.
These six internal resources support deeper specification work without duplicating the purpose of this manufacturer page.
Practical answers for ventilation distributors, fan suppliers, contractors and OEM buyers preparing a duct RFQ.
DERFLEX can discuss both supply routes. Buyers that fabricate locally may source PVC coated duct fabric, while projects that need ready-to-install sections can request finished flexible ducts with welded body, reinforcement, suspension and connection details. State the required supply format in the RFQ.
Layflat ducting does not rely on a continuous internal helix and is commonly used for positive-pressure forced-air supply, where the fan inflates the duct. Spiral reinforced ducting uses wire or another shape-support method and is typically evaluated for suction, extraction, bends or equipment connections where the duct needs to resist collapse.
Yes, these items can be discussed by project. The final configuration depends on fan interface, airflow direction, route geometry, handling length, connection method, material selection and production confirmation. Custom marking and packing can also be reviewed for OEM programs.
Project-specific flame-retardant and antistatic directions can be discussed. The buyer should identify the required test method, market or project specification rather than relying only on a generic “FR” or “antistatic” label. Final compliance should be confirmed by the approved material construction and requested test documentation.
Start with fan outlet size, airflow direction, available pressure information, desired diameter, total duct run, section length, bends or branches, connection style, suspension method, operating environment, required test criteria, quantity and destination. Photos are useful when replacing an existing duct.
OEM programs can be organized around an approved specification covering coated fabric, duct dimensions, color, reinforcement, cuffs, zippers or rings, suspension, identification and packing. Repeat-order consistency depends on keeping those agreed details controlled rather than treating each order as a generic stock duct.
Send the duct diameter, airflow direction, total run, section length, connection method, application and required documentation. DERFLEX can review the specification direction and prepare a project quotation.
