First, which of the three machine classes do you need?
This is the decision that prevents a wasted purchase, because the three classes are genuinely different machines:
1. Aluminium / foil flexible duct forming. Spiral-winds aluminium foil, metallised PET or laminated multi-layer strip — usually with a wire helix for reinforcement — into the bare flexible core, typically from about 80 to 600 mm diameter. This is what most people mean by a "flexible duct machine".
2. Insulated flexible duct line. Takes the bare core and adds a glasswool or polyester insulation layer plus an outer jacket, then packs the finished product. It is a longer line, not a single machine.
3. Flexible (fabric) duct connector. Makes the canvas/fabric-to-metal connectors that join rigid duct to fans and air handlers. A different product entirely, made on a different machine.
Few makers do all three well. Decide your class first, then compare within it.
The shortlist at a glance
The table is the short version; the sections below explain each. Positioning reflects the broad 2026 market and is not a measured benchmark. Confirm specifications, materials and support directly before buying.
| Maker / tier | Class | Positioning | Notes |
|---|
| Piton Engineering Service (NL) | Foil forming / insulated lines | Premium European specialist | Production-line focus |
| Dongyang INNO, BOBO, Zhenhuan, GFI, MYT | Aluminium / foil forming | Pure-play export specialists | Deep catalogs, aggressive price, variable support |
| Production Products (PROFAB Flex Pro, US) | Fabric connector | US connector specialist | Different machine class |
| SBKJ Group | Full flex cell | Specialist value (Australian supplier) | Forming + connector + insulation + shrinking |
Positioning is indicative of the broad market in 2026, not a measured benchmark. Brand and product names are the property of their respective owners, referenced here for honest comparison only. Note: spiral round-duct specialists (e.g. makers of rigid Tubeformers) are sometimes listed in "flexible duct" roundups by mistake — they make rigid duct and are out of scope here. Confirm specifications before purchasing.
Piton Engineering Service — the European specialist
Piton Engineering Service (PES), based in the Netherlands, is a specialist in flexible air-duct production lines, with a focus on laminated and foil flex forming. For a producer wanting a premium European production line and the engineering depth that comes with it, PES is a specialist reference point in a field otherwise dominated by export makers. Best for: producers wanting a premium European foil-flex production line.
The pure-play export specialists
Most flexible-duct forming machines come from a field of pure-play export specialists. Dongyang INNO has one of the deepest flex-machine catalogs; BOBO, Zhenhuan, GFI and MYT all build aluminium/foil forming machines in single and double layer, wire-reinforced configurations. This tier offers the widest model choice at the lowest prices. As across any broad export field, build quality, line speed and after-sales support vary considerably from one maker and model to the next, so verify the diameter range, layer count and wire reinforcement against your product, and ask for a reference installation. Best for: price-first buyers of aluminium/foil flex forming who can self-support.
Production Products (PROFAB Flex Pro) — fabric connectors
If your product is the fabric flexible connector rather than flex duct itself, that is a separate machine class, and Production Products (US) automates it with the PROFAB Flex Pro connector processing line. Do not expect a foil-forming specialist to make connectors or vice versa. Best for: shops producing fabric-to-metal flexible connectors.
SBKJ Group — the full flex cell
This is our own machinery, so read it as a vendor's case. SBKJ's position in flexible duct is breadth across the classes: it supplies the whole flex cell — aluminium flexible duct forming (the SBLR range), canvas/fabric flex, the flexible duct connector, insulation and end-shrinking machines — so a producer can equip a complete flex line from one vendor instead of pairing a forming machine from one maker with a connector machine from another. SBKJ has built HVAC duct machinery since 1995, with 5,000+ machines in 100+ countries, ISO 9001:2015 and CE certified, catalog-accurate specs and direct engineer support. Best for: buyers equipping a complete flex cell who want the stations matched and supported together at export-competitive pricing. Where it is not the answer: if you need only a single premium foil-forming line, a dedicated European specialist may suit better.
How to choose — four questions
1. Which class? Foil forming, insulated line, or fabric connector — settle this first; it eliminates most of the field.
2. Diameter, layers and materials. Confirm the diameter range (commonly 80–600 mm), single vs double layer, wire reinforcement, and material compatibility (aluminium foil, metallised PET, laminate) against your product mix.
3. One machine or a cell? Bare flex needs a former; insulated flex needs forming plus insulation/jacketing and packing; a connector is separate. Buying the cell from one vendor keeps the stations matched.
4. Verify and support. Insist on a published specification, a reference installation in your class, and clear support terms — flex lines run continuously and downtime is costly. For budgets across the machine set, see the duct machine cost guide.
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FAQ
What are the different types of flexible duct machine?
Three classes buyers often confuse: aluminium/foil forming machines that spiral-wind foil strip into the bare core; insulated flex lines that add insulation and a jacket and pack the product; and fabric connector machines that make canvas-to-metal connectors. Decide which you need before comparing brands — few makers do all three well.
Who makes the best flexible duct machine?
It depends on class and market. Piton Engineering Service (Netherlands) is a premium European foil-flex specialist. A broad export field (Dongyang INNO, BOBO, Zhenhuan, GFI, MYT) builds aluminium/foil formers at aggressive prices with variable support. Production Products (PROFAB Flex Pro, USA) handles fabric connectors. SBKJ supplies the full flex cell — forming, fabric, connector, insulation, shrinking — as a certified Australian supplier.
What diameter and materials do flexible duct machines handle?
Aluminium/foil forming typically covers about 80–600 mm, running aluminium foil, metallised PET or laminated strip, usually wire-reinforced. Insulated flex adds glasswool or polyester. Confirm the exact diameter range, layer count, wire reinforcement and material compatibility against your product mix.
Should I buy separate machines or a full flexible duct line?
Depends on volume and product. Bare aluminium flex may need only a forming machine; insulated flex needs forming plus insulation/jacketing and packing; connectors are a separate class. Buying the cell from one vendor keeps stations matched and supported together; piecemeal can be cheaper up front but leaves you integrating different makers.
What certifications should a flexible duct machine manufacturer have?
ISO 9001:2015 and CE marking are the baseline. Beyond certificates, ask for the published specification (diameter, layers, materials, output), a reference installation in your product class, and the support terms — commissioning, training, warranty and parts.
