Ducting & piping contractor

Ductwork and piping, built to exacting tolerance

Rectangular and spiral ductwork, process ventilation, pipe spools, racks and equipment hook-up — fabricated in our own Johor Bahru workshop and installed by our crews onshore and offshore across South East Asia.

HVAC & ducting Piping

Spiral & rectangular duct
Process ventilation
Pipe spools & manifolds
Pipe racks & hook-up
Onshore & offshore

80″Max fitting diameter

13Gauge material capacity

6.3tOverhead crane, in-house

2025Singapore Zoo — ductwork

Ducting

Rectangular & spiral ductwork

Auto Fold and CNC forming to 13-gauge, fittings to 80″ diameter, CAD drawn and barcode ticketed. All materials and gauges in stock.

Recent: HVAC ductwork installation at Singapore Zoo, 2025.

See the full HVAC capability

Rectangular duct mains and branches installed to the soffit of a commercial building

Fabricated rectangular duct sections stacked and ready for installation

Large-diameter galvanised spiral duct main run installed at high level

Ducting systems we build

Ducting systems

Rectangular ductwork

Auto-folded duct and fittings, all stocked materials and gauges.

Spiral ductwork

Up to 80″ diameter, gored and welded on purpose built machines.

Process ventilation

Dust collection makeup air, pneumatic conveying, heat control fans.

Rooftop HVAC

New units and change-outs, curb adapters, roofing, start-up.

Piping

Spools, headers & manifolds

Carbon steel through to chrome moly, duplex and SAF, clad plate and exotics. Welded in screened bays, erected and tested by the same crews.

Awarded the piping fabrication and installation works for RFCC 2 on RAPID P1 Onshore, as piping subcontractor.

See the full piping capability

Stainless steel header with multiple branch outlets and flanged connections in the fabrication shop

External pipe rack with valves and pump connections

Actuated valve manifold installed above a pump chamber

Piping work done

Our pipework, in the shop and on site

Spools, manifolds, purge welding, hook-up, racks.

Valve and actuator assembly built into a stainless spool with joints purge-taped ahead of welding

Pump house pipework, valves and pump sets installed and connected

Completed rack carrying multiple pipe runs and cable tray

Crew lifting a flanged pipe spool into position under supervision

Pump and valve pipework taking shape at the base of a tank farm

Pipework and support steel installed at height under fall protection

See more piping work

Ducting work done

Our ductwork, on site

Mains, insulated risers, transitions, supports.

High-level rectangular duct with plenum box and insulated branch connection

Insulated duct mains and risers with pipework in a services zone

Car park ventilation duct main running the length of the slab

Rooftop fan and ductwork installed on plinths

Foil-clad insulated duct main supported from the slab

Duct installation in progress from a scissor lift

See more ducting work

Also from JOVA

Supporting disciplines

Flanged carbon steel pipe spools laid out in a screened welding bay

Piping

Spools, headers and manifolds, fabricated and installed.

Structural

Plate rolling, heavy wall sections, fan housings, modules.

Prefabricated removable insulation mattress fitted to plant equipment

Insulation & refractory

Hot and cold, thermal, A60, sound barrier, cladding. Refractory to boilers and furnaces.

Maintenance crew working on an offshore platform walkway

Maintenance & shutdown

Welding, fitting, machining, rigging, scaffolding, coatings, abseiling. FPSO and platform hook-up.

Licensed operative in full protective suit removing asbestos roof sheeting

Asbestos abatement

Survey, removal, air monitoring, encapsulation, disposal. Fully licensed.

Building plant room with chilled water pipework, valves and pumps

Facilities management

M&E, HVAC, plumbing, building fabric, cleaning, security and grounds under one contract.

Welder grinding a steel beam with sparks flying

Manpower supply

Sourcing, screening, work passes, onboarding. Professional to general.

JOVA workshop interior with 6.3 tonne overhead travelling crane

Our facility

The workshop

Permas Sentral, Johor Bahru. CNC plasma cutting, a 6.3 tonne overhead crane, an automated ductwork line and screened pipe spool bays.

Tour the facility

Strategic partnership

Seven Star Hills Sdn Bhd

In strategic partnership with Seven Star Hills Sdn Bhd — pipeline fabrication, offshore support, equipment installation and turnkey EPCC.

The piping partnership

Seven Star HillsSdn Bhd

Industrial engineering, fabrication and turnkey project delivery. Established 2005. Masai, Johor.

Piping & pipeline
Marine & offshore
EPCC
Machining

Send us your drawings

Duct layouts, isometrics or both.

Request a quote +60 7-382 4862