Custom PVC-coated flexible ventilation ducting built around the fan, pressure direction, route geometry and connection system—not around a generic hose description.
DERFLEX supports mine, tunnel, industrial blower, exhaust and temporary ventilation programs with finished duct fabrication, selectable reinforcement, welded construction, custom cuffs and project-defined material options. Final dimensions and performance claims are confirmed against the approved construction and requested test method.
The duct wall matters, but field performance also depends on seam layout, reinforcement, fan connection, suspension and section handling. A flexible ventilation duct factory should be able to translate operating data into a repeatable finished-product specification.
DERFLEX combines coated-textile knowledge with finished duct fabrication. That allows the PVC-coated body material, weldability, reinforcement and end interfaces to be discussed within one procurement process.
Fabric weight is useful for describing construction direction, but it does not by itself define pressure capability, air leakage, flame behavior, static performance or service life.
A practical factory quotation should connect the material specification to the complete duct assembly and the actual operating condition.
Flexible ducting should first be separated by pressure direction and installation geometry. Accessories and optional treatments are selected after the basic structure is correct.
Collapsible duct sections for forcing fresh air through tunnels, mine headings, construction zones and other temporary routes.
Shape-retaining flexible hose for extraction, suction, exhaust, tight bends and equipment interfaces.
Shaped, oval, transition and accessory sections where a round duct conflicts with clearance, vehicles or equipment.
DERFLEX can coordinate the coated textile and fabricated components so the finished duct is quoted as one assembly.
Flexible coated surface selected for weldability, moisture resistance, handling and the intended air stream.
Knitted or woven textile structure provides the tensile and tear framework for fabricated ducting.
Seam design is coordinated with diameter, section length, leakage control and repeated site handling.
Continuous helix, rings or local reinforcement may be added where suction or geometry requires shape support.
Zippers, rings, drawstring cuffs, straps, eyelets, hanging fins and project-specific interfaces complete the assembly.
The ranges below are for early procurement discussion. The approved datasheet, sample and required test documents should govern the final order.
| Finished product | Fabricated flexible ventilation duct section with welded body, selected suspension system, end connections and optional reinforcement. |
|---|---|
| Base construction | Knitted or woven polyester technical textile with PVC coating on both sides; formulation and textile structure selected by application. |
| Typical fabric weight | Approx. 400–900 g/m2 reference range, or project-specific after pressure, handling and abrasion review. |
| Reference diameter | Approx. 300–3000 mm; non-standard sizes can be reviewed against airflow, fan interface and available clearance. |
| Section length | Approx. 1–100 m; practical length depends on diameter, packed volume, installation method and route maintenance. |
| Duct structures | Layflat positive-pressure duct; spiral wire-reinforced supply/exhaust hose; shaped/oval duct; custom transitions and fittings. |
| Connection options | Steel ring, zipper, drawstring cuff, hook-and-loop, belt/strap, fan adapter or project-specific coupling. |
| Suspension | Reinforced fins, eyelets, straps, loops or custom hanging geometry according to route and installation practice. |
| Color & identification | Yellow, orange, black and custom colors subject to material and production confirmation; OEM labels, airflow arrows and section IDs can be discussed. |
| Optional performance direction | Flame-retardant, antistatic, abrasion-focused, cold-weather or other formulations can be developed against a named requirement and test route. |
| Accessories | Reducers, bends, Y/T branches, transition pieces, repair sections, fan connections and other fabricated components by drawing or measured interface. |
Reference values are not universal guarantees. Final pressure, flame, static, temperature and service performance depend on the confirmed construction, manufacturing tolerances, test method and complete ventilation system.
A controlled workflow reduces fitting errors, avoids mixing positive- and negative-pressure structures and makes later replacement orders easier to reproduce.
Confirm mine, tunnel, blower, exhaust, confined-space or industrial duty and identify the governing project requirements.
Review outlet diameter, pressure direction, airflow target, total run, bends, clearance and section handling length.
Select coated-textile structure, weight direction and optional formulation according to pressure, abrasion and requested testing.
Freeze wire or ring reinforcement, seams, cuffs, couplings, hanging geometry, fittings and identification.
Confirm dimensions, interface compatibility, workmanship and documentation before repeat-volume production where required.
Produce the approved duct construction and check agreed fields such as dimensions, seams, fittings, reinforcement and labels.
Organize bag, carton or pallet packing, section numbering and project marks for transport, storage and site distribution.
Use the approved specification as the reference for future replacement sections and OEM production programs.
Undersized diameter, excessive bends, leaking joints, weak suspension or the wrong duct structure can consume available fan pressure and create repeated maintenance work.
That is why DERFLEX recommends defining the complete duct route and acceptance requirements before freezing a factory quotation.
For industrial and underground procurement, quality control should be tied to the approved specification rather than broad marketing claims.
Confirm the selected coated textile construction, color, reinforcement direction and ordered material option.
Inspect dimensions, seam condition, wire/ring placement, cuff details, hanging points and accessories.
When flame or antistatic performance is required, identify the exact method, acceptance criterion and applicable construction before production.
Project codes, section numbers, airflow arrows, OEM markings, packing labels and agreed inspection records can support site control.
The same search term can describe very different operating conditions. The duct structure should be matched to the actual ventilation task.
Forced fresh-air supply, localized extraction and advancing duct routes where diameter, suspension and site safety requirements must be coordinated.
Long temporary duct runs for road, rail, metro, hydropower and civil engineering work, including branches and low-clearance routing.
Flexible sections matched to portable axial fans and blowers for cooling, drying, fresh-air delivery and controlled work zones.
Shape-supported hose for welding fumes, process-air removal and industrial extraction where suction requires the bore to remain open.
Ducting for tanks, vessels, manholes, utility vaults and service areas, configured to the blower interface and work route.
Repeat-specification duct kits, custom cuffs, private markings and packing for distributors, fan brands and rental fleets.
A custom ventilation duct manufacturer should make interface and field-use details part of the product specification, not leave them as last-minute accessories.
DERFLEX can review drawings, existing samples or fan outlet measurements to define the finished duct configuration for a project or OEM program.
Size sections around airflow, fan pressure, handling weight, packed volume and installation sequence.
Zippers, rings, cuffs, belts, reducers, branches, fan adapters and replacement interfaces.
Helical wire, rings, reinforced edges, wear strips and suspension details based on pressure and route geometry.
Color, labels, section IDs, airflow arrows, buyer codes, packaging and private-label details by agreement.
Material direction can be discussed against the exact standard and report scope required by the project.
When required, state the resistance limit and test method separately rather than assuming it from a flame-retardant description.
More complete operating data allows a factory to select the correct duct structure and reduces revision cycles after quotation or sampling.
Request A Project QuoteThese pages cover finished duct types, industrial airflow, tunnel projects and safety-related configuration in more detail.
Short answers for contractors, mine operators, industrial buyers, fan suppliers, distributors and OEM procurement teams.
Send the application, airflow direction, fan outlet size, available pressure or airflow data, route length, bends, preferred diameter and section length, coupling, suspension method, any flame or antistatic requirement, quantity, destination and available drawings or photos.
Layflat duct is commonly selected for positive-pressure air delivery because fan pressure inflates the duct. Spiral wire-reinforced duct is generally used when the hose must retain its bore during suction, extraction or tighter routing. Final selection should consider the complete fan and ro, ute data.
DERFLEX currently uses approximately 300–3000 mm as a reference range for flexible ventilation duct products. Final size should be reviewed against airflow, fan pressure, route length, clearance and duct structure; non-standard requirements can be discussed separately.
These performance directions can be discussed when the project identifies the required test method and acceptance limit. Flame and antistatic performance are separate fields, and the final claim should correspond to the approved construction and applicable test evidence.
Yes. Fan outlet measurements, connection photos, drawings or an existing sample can be reviewed so the cuff, adapter, diameter and section format are developed around the actual equipment interface.
DERFLEX can discuss repeat specifications for distributors, ventilation-equipment brands and project suppliers, including dimensions, cuffs, colors, markings, section identification and packaging subject to the approved order specification.
Send your pressure direction, fan interface, route, duct size, connections and required test criteria. DERFLEX can review a suitable finished-duct structure for quotation and sampling.
Product information is provided for procurement discussion. Final suitability, pressure capability, temperature range, flame behavior, antistatic performance, regulatory compliance and safe operation depend on the confirmed product configuration, applicable test methods and the complete ventilation system used at the site.
