Vortex Acoustic Ducting - Insulated Ducting That Cuts Fan Noise
Best for: growers running an inline extraction fan who need to quieten the system down without fitting a separate silencer box.
Our thoughts
If your grow room shares a wall with somewhere you actually sleep or live, standard ducting on a decent-sized fan gets old fast. This swaps the noise problem out for a quieter hum without adding another box to your extraction line. It won't make a loud fan silent, but it takes the edge off in a way that's genuinely noticeable, and it installs exactly like normal flexible ducting.
Vortex Acoustic Ducting is flexible ducting with a built-in noise barrier: an inner and outer layer of ducting with a layer of sound and heat-insulating fibreglass packed between them. That insulation layer absorbs vibration from the airflow before it can transfer through to the outer wall and radiate as noise, which is the main source of that persistent fan drone you get with plain ducting.
It's built on the same flexible spiral-wire frame as standard ducting, so it bends round the same tight corners and connects to the same clamps and fittings, it's just a thicker, heavier product because of the insulation layer.
How it compares
Acoustic ducting sits between standard flexible ducting and a dedicated in-line silencer in both cost and effect.
- Compared with plain flexible ducting, it noticeably cuts operational noise for a modest price increase, with no change to how it fits or installs.
- Compared with Rhino Silent Ducting, another well-known insulated ducting line, it works on the same fibreglass-barrier principle and covers similar diameters and lengths.
- Compared with fitting a standalone in-line silencer alongside standard ducting, this saves the extra length and cost of a separate unit by building the noise reduction into the ducting run itself - though a dedicated silencer will generally cut more noise if that's your priority.
It's the sensible middle option: a real, noticeable drop in fan noise without the extra cost and space of a full silencer setup.
Usage guidance
Fits and installs the same way as standard flexible ducting.
Sizing
Match the diameter to your fan and carbon filter (commonly available from 100mm/4in up to 300mm/12in) - using a size smaller than your fan outlet will restrict airflow and add strain.
Installation
Stretch the ducting to length between your fan and vent point, secure with duct clamps at both ends, and avoid tight kinks or sharp bends, which reduce both airflow and the acoustic benefit.
Run length
Sold in 5m and 10m lengths - buy the length that lets you run a fairly direct route rather than stretching a shorter length taut, which increases resistance.
Technical specifications
- Construction: fibreglass insulation layer between inner and outer ducting walls
- Frame: flexible spiral wire, bends round tight corners
- Diameters available: from 100mm (4in) up to 300mm (12in), depending on stock
- Lengths available: 5m and 10m
- Compliance: meets VOC emission standards
- Installation: fits standard duct clamps, no special tools required
- Brand: Vortex
Who this is for
- Growers with a tent or room in a noise-sensitive spot - lofts, spare bedrooms, shared or terraced housing
- Anyone running a 4-12 inch inline fan who's found standard ducting too loud for the space
- Growers upgrading an existing setup without wanting to fit a full separate silencer
- Loft and cupboard grows where duct runs pass close to living space
Our take
Fan noise is one of those things you don't notice until you're trying to sleep two rooms away from it. Acoustic ducting is a straightforward, low-effort fix - it goes in exactly where standard ducting would, just quieter.
Does exactly what it should, day in, day out - a sensible upgrade over standard ducting if noise is even slightly a concern for your setup.
