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SPIRAL DUCT PRODUCTION

Spiral Duct & Fitting Machines

Build the duct body, then match the fittings and connections.

BOBO supplies spiral tubeformers for round metal duct, ovalizers for prepared round duct, and equipment for elbows, flange rings and fitting ends. Select a production setup around the duct section, material and joint design, with cutting and joining equipment matched to the work your shop performs.

Spiral round duct forming with model-specific tooling

Separate flat-oval and elbow production routes

Flange forming, end preparation and welding equipment

Spiral Duct Machine

BTF-III spiral duct forming machine

BTF-III spiral duct forming machine

DEFINE YOUR DUCT AND JOINT

Round or oval section, metal thickness and connection detail.

FIND YOUR MACHINE

Choose the forming route and the supporting stations.

Compare BTF tubeformers by forming head, material range and cut-off method. The spiral welding line uses a welded joint; the ovalizer starts with prepared round duct. For fittings, compare plasma cutting and sheet rolling with elbow seaming, welding, beading and flange equipment. Auto-line III serves rectangular duct preparation, while the flexible-duct model makes wire-reinforced foil and film duct: these are separate production routes.

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Working ranges are model-specific. Confirm material, product dimensions and the required operation against the selected machine.

PARTS & APPLICATIONS

Round duct, shaped sections and connecting parts

A duct workshop may produce straight lengths, bends and connecting parts in different batches. Match each part to its forming or joining operation so the equipment fits the actual order mix.

Round spiral duct

01

Round spiral duct

Metal strip is formed into straight round duct with a spiral lock seam for HVAC ventilation. Match the forming head, seam arrangement and cut-off system to the duct specification.

Flat-oval duct

02

Flat-oval duct

Prepared round duct is reshaped into a wider, shallower section for installations with restricted height. Both finished axes and the section length guide the ovalizing setup.

Segmented duct elbows

03

Segmented duct elbows

Cut and rolled duct segments are flanged and joined into an elbow. The joint profile and section sizes guide the seaming tools and the upstream blank preparation.

Corrugated elbows

04

Corrugated elbows

A separate hydraulic forming route makes corrugated bends from prepared tube. Select the tools around the incoming tube and the specified bend geometry.

Circular flange rings

05

Circular flange rings

Angle-section rings provide connecting flanges for round duct. Compare flange forming and profile rolling equipment, and include any required hole-making and ring-end joining operations in the workshop plan.

SELECTION GUIDE

Start with the duct section and connection detail.

Round diameter alone is not enough to select equipment for a duct workshop. Material grade and thickness influence the forming head and cutting system; oval dimensions and elbow construction lead to different machines. The end connection determines whether flange rings, beads, rolled edges or gasket fitting are needed.

01

Define the finished duct and fitting family

Separate straight round duct, flat-oval sections, segmented elbows and corrugated bends. Set the section dimensions and joint design first: each construction requires its own forming or assembly route.

02

Match material, tooling and cutting

Review metal grade and thickness with the selected tubeformer. Compare spring-steel and fixed mold arrangements, the required diameter tools, and saw or shear cut-off. For fittings, add the roller profile, prepared blank or incoming tube specification.

03

Balance the workshop around finished output

Set target lengths or pieces per shift at the actual size mix. Include coil and tooling changes, straight-duct handling, fitting preparation and assembly. This identifies whether the next investment should be a main former or a supporting station.

Plan space for coil loading, straight duct run-out and moving large fittings between stations. Compare finished duct and fitting output across the whole workflow, including size changes and assembly.

YOUR FINISHED PART

Start with your product drawing.

AI illustration comparing round and flat-oval spiral duct samples and section outlines.

Include the material, dimensions and acceptance requirements.

AI illustration of open round and flat-oval duct offcuts with a straightedge.

From technical review and testing to delivery and after-sales.

Review the duct and the joint as one production task.

BOBO can help review the equipment sequence, forming tools and shop layout. Build the production trial around representative duct sizes and materials, checking cut lengths, formed sections and mating connections. Agree the acceptance checks, operator training, spare tooling and after-sales support with the supply scope.

Duct drawings, materials and joint review

Forming heads, rollers and cut-off selection

Sample forming and connection fit checks

Layout, operator training and spare tooling

Service

BEFORE YOU CHOOSE

Before you choose spiral duct equipment

These answers explain the distinctions between tube forming, reshaping and fitting production.

Discuss your application

The BTF-I uses a spring-steel forming die and synchronized saw cutting. The BTF-II uses a fixed forming mold with roll-shear cutting, while the BTF-III has cast-aluminum forming molds and a slitting cutter. Compare tooling for your diameter mix and the material-specific working range. A fixed mold does not mean that every diameter uses the same tool.

The BOT-I reshapes prepared round duct into a flat-oval section. Start with the required finished width, height and length, then match the incoming round duct and forming tools. Include the round-duct production stage separately when planning a workshop from raw coil.

For segmented elbows, the work starts with cut and rolled sections, followed by flanging and lock-seam assembly. A corrugated elbow former shapes an existing tube using dedicated tooling. The elbow welding equipment joins prepared elbow pieces. These routes produce different constructions, so choose from the specified elbow design and joint detail.

No. Feed speed measures the strip entering the machine. Finished duct length also depends on diameter and spiral geometry, while cut-off cycles, coil changes and handling affect output per shift. Compare proposals using finished lengths or pieces for the same duct specification and production schedule.

Angle-section flange equipment forms circular rings; beading and flanging machines prepare shaped duct ends. The fitting shaper handles rolled edges and gasket fitting, while the canvas connector line produces metal-edged flexible connection strip. Select these by the joint drawing. An angle-ring punching unit is an additional option, and a gasket fitting machine alone does not establish a leakage classification.

START WITH A DRAWING OR SAMPLE

Send the duct drawing and the connection you need.

Include round diameter or oval width and height, straight lengths, elbow construction and angle, end-connection details, material grade and thickness, and the required quantities per shift. For coil-fed production, add strip width and coil dimensions. A fitting drawing or sample helps define the tooling and assembly sequence.

Discuss my project

Tell us which operations you already have, the stations you want to add, and the available floor space and power supply.

AI illustration of a short spiral duct sample, flat metal coupon and section drawing.

Spiral Duct Machine / BOBO MACHINE