Spiral & rectangular ductwork
Complete duct systems — mains, branches, transitions, plenums and fittings up to 80″ diameter, formed on the auto fold and CNC line and barcode labelled.
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HVAC
HVAC rectangular & spiral ductwork, process ventilation, rooftops
CAD generated drawings and barcode ticketing, so every component is traceable from the shop floor to its position on site.
Fabrication
An automated line, built for accuracy
Our state of the art Auto Fold & CNC machines fabricate using up to 13-gauge material — and we stock all materials and gauges.
Fittings up to 80″ diameter, gored and welded on purpose built machines. Every piece leaves drawn, numbered and labelled — the crew opens a kit, not a pile.
- CAD generated fabrication drawings for every system
- Custom ticketing with barcode labelling — all parts accounted for
- Auto Fold & CNC forming up to 13-gauge material
- Fittings up to 80″ diameter, to exacting tolerance
- Purpose built welding and assembly machines to gore and weld
- All materials and gauges held in stock
At a glance
Ductwork fabrication capability
| Duct types | Rectangular and spiral ductwork, fittings and transitions |
|---|---|
| Maximum fitting diameter | Up to 80″ (approx. 2,032 mm) |
| Material thickness | Up to 13-gauge |
| Materials stocked | All materials and gauges held in stock |
| Forming | Auto Fold and CNC machines |
| Joining | Purpose built welding and assembly machines — gore and weld |
| Documentation | CAD generated drawings; custom ticketing with barcode labelling |
| Quality system | ISO 9001 (UKAS) QMS; bespoke inspection & test plan; Production Data Record Book |
| Lifting & handling | 6.3 tonne overhead travelling crane in the workshop |
| Delivery | Heavy haulage route 8.5 km from the workshop — no vertical obstructions, up to 15 m wide; barging across South East Asia |
Systems
What we fabricate and install
Fans for heat control, design/build dust collection makeup air, pneumatic conveying — the facility and the manpower to build them when you need them.
Process ventilation
Dust collection makeup air, pneumatic conveying and industrial extract — built around the process, with fan housings made in the same shop as the duct.
Fans & heat control
Fans for heat control and the ducting, housings and supports that go with them, plus modules and heavy engineering equipment.
Rooftop HVAC
Crane trucks and crews for new units or change-outs — curb adapters, duct modifications, roofing works and start-up.
Spiral ductwork, installed
Large-diameter spiral, going in
Mains, couplings and supports set out from access platforms and fixed by our own crews.
Ducting work done
Installed on site
Rectangular mains, insulated risers, transitions and supports. Select any photo to enlarge.
Rooftop specialists
New units, change-outs and everything the roof needs
Rooftop HVAC is one of our specialities. We have the crane trucks and experience for installing new units or to change out units.
- New rooftop unit installation
- Like-for-like and upgrade change-outs
- Roof curb adapters
- Duct modifications to suit the new unit
- Required roofing works
- Equipment start-up
Duct insulation & acoustics
Thermal and acoustic treatment, by the same crew
JOVA specialises in insulation, jacketing and refractory works, and has undertaken various insulation projects over the years.
Hot and cold insulation, thermal and A60, sound barrier, in-situ polyurethane foaming, and prefabricated mattresses that come off and back on at each shutdown.
- Mineral wool / rock wool
- Calcium silicate
- Wiremesh slabs
- Isolite Kaowool
- Armaflex
- Personnel protection (PP)
- PU foam
How we work
Drawing to start-up
The same team takes a ducting package from the first CAD drawing to a commissioned, insulated, documented system.
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Enquiry & take-off
We review your drawings, materials and programme, and price the fabrication and installation scope.
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CAD drawings
Fabrication drawings are generated for every run, fitting and support before a sheet is cut.
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Fabrication & ticketing
Auto fold and CNC forming, welding and assembly, with custom ticketing and barcode labelling on every part.
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Inspection
QC personnel check against client requirements, international design codes and our bespoke inspection and test plan.
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Delivery
To site, Johor Port or Singapore via a heavy haulage route 8.5 km away; barging where needed.
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Installation & start-up
Our crews erect, connect, insulate and start up, then hand over a Production Data Record Book.
Also from the same workshop
Piping runs beside the duct — and we build that too
The duct main and the process line usually share the same rack and the same congested ceiling void. We fabricate and install both.
Have a ducting package to price?
Send the drawings and the programme. If there is piping in the same scope, put it in the same enquiry.