Combi Ducting — Reinforced Flexible Ducting for Grow Room Ventilation
Best for: Growers who need tough, tear-resistant ducting that won't perforate during install or routine maintenance
Our thoughts
Combi ducting sits in that sweet spot where you get real durability without paying acoustic ducting prices. The plastic outer layer means it can actually take a bit of rough handling during setup — something standard aluminium simply can't. One we recommend a lot for growers building or expanding their ventilation systems.
Combi ducting is reinforced flexible ducting built from a laminated aluminium and polyester inner shell, supported by high-tensile steel wire, and wrapped in a protective black PVC outer layer. It's designed to channel air efficiently through your grow room ventilation system — pulling CO2 in, pushing heat and humidity out — whilst staying tough enough to handle the real world of installation and maintenance.
How it compares
Combi sits firmly between standard aluminium and acoustic ducting.
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vs Standard Aluminium: Significantly more tear and puncture resistant. Aluminium alone is easy to perforate; combi's plastic layer stops that dead.
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vs Acoustic Ducting: Better value and more flexible for tight spaces. Noise reduction is moderate rather than maximum, but the cost difference is real.
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Light-tight performance: The double-layer construction prevents light leaks where standard ducting doesn't.
In practical terms, you're paying slightly more than basic aluminium but substantially less than acoustic — and getting a ducting that actually survives rough handling.
Usage guidance
Installation
No special tools needed. Pierce the aluminium sheath with a sharp knife where you need to cut, use wire cutters to sever the steel helix, and secure with Jubilee clips or fast clamps. Keep runs as short as practical to avoid sagging and pressure drop.
System integration
Works cleanly with inline fans, carbon filters, and air-cooled lighting. Check all connections for air-tightness by running a lit splint around seals — any smoke drawn in means you need to tighten that joint.
Temperature range
Rated -30°C to +140°C, so it handles everything from winter intake air to summer heat rejection without degradation.
Technical specifications
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Construction: Aluminium/polyester laminated inner, high-tensile steel wire helix, black PVC outer layer
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Available diameters: 100mm (4″) through 300mm (12″)
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Standard lengths: 5 metre, 6 metre, and 10 metre options
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Supplied compressed: 0.4–0.6 metres for easy transport and storage
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Temperature range: -30°C to +140°C
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Maximum air velocity: 30 m/sec positive
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Working pressure: 2500 PA
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Wire pitch: 25mm (up to 102mm diameter); 37mm (125mm and over)
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Fire resistance: Non-toxic in fire scenarios — tested and certified
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Interior surface: Smooth aluminium — minimal pressure drop, no dust collection
Who this is for
- Growers building or upgrading ventilation who've had standard ducting tear on them before
- Anyone running extraction fans, carbon filters, or light-cooled hoods where durability matters
- Spaces where light-tight ducting is needed but acoustic solutions are overkill or over-budget
- First-time installers who want ducting tough enough to survive mistakes and repositioning
Our take
Combi ducting is the practical choice for serious growers who don't want their ducting compromised on install day. It's tough without being overspecced, straightforward to fit, and actually stays tear-free when you're running it through a tent or rigging it into awkward corners.
If you're building a proper ventilation setup and want ducting that'll take a bit of rough handling, worth picking up while clearance stock lasts. Does exactly what it should, day in, day out.
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