AC Infinity Ducting & Silencers
The ducting is where a good extraction setup is won or lost. This range covers the run from the fan out: AC Infinity inline duct silencers that cut fan noise by up to 50%, noise reduction clamps that stop vibration travelling into the ductwork, four-layer flexible ducting in 100, 150 and 200 mm, and the clamps, tape and window kit that hold it all together and seal it. Quick Bloom Lights is the official Australian importer for AC Infinity: stocked in Sydney, shipped domestically.
Up to 50%
fan noise reduction (AC Infinity)
100–200 mm
4, 6 and 8 inch sizes
4 layers
aluminium and PVC ducting
Genuine
genuine AC Infinity, QBL-backed
Where fan noise actually comes from
Three things make a ventilation setup loud, and each has its own fix. The motor and blade make airborne noise that travels down the duct — that is what a silencer absorbs. The fan body passes vibration into whatever it touches, and that structure-borne noise is what a rubber noise reduction clamp isolates. And fast air through tight bends makes turbulence noise, which comes down to sizing the duct properly and keeping the run smooth. Fix the one that applies and the room gets noticeably quieter.
AC Infinity inline duct silencers
A duct silencer is a galvanised steel cylinder lined with egg-crate neoprene foam, with a full-size opening straight through the middle. Air passes without a restriction while sound waves are absorbed by the foam, so AC Infinity rate it at up to 50% noise reduction. The flanges are reversible stainless steel, so it slips over your fan collar and ducting either way round, and it works on intake or exhaust.
| Silencer | Fits fan / duct | Length × diameter | Matching clamp |
|---|---|---|---|
| AC Infinity 4″ silencer | 100 mm | 38.0 × 17.7 cm | 100 mm noise clamp |
| AC Infinity 6″ silencer | 150 mm | 53.0 × 22.7 cm | 150 mm noise clamp |
| AC Infinity 8″ silencer | 200 mm | 68.4 × 27.8 cm | 200 mm noise clamp |
Fit the silencer straight onto the fan outlet, where the noise is loudest, and use a short length of ducting between it and the filter or vent. Already running a VIND silenced fan? Those have the acoustic treatment built in, so a separate silencer is not needed.
AC Infinity noise reduction clamps
The AC Infinity noise reduction clamp is a thick nitrile rubber coupler with two stainless steel worm-drive clamps. It joins fan to filter, fan to ducting or fan to silencer with an airtight seal, and because the joint is rubber rather than metal-to-metal it breaks the path that vibration uses to get into your ductwork and tent frame. It is the cheapest noise fix in the range and takes two minutes to fit.
Quietest setup, in order of impact. Size the fan so it runs at a lower speed rather than flat out, hang it on straps instead of hard-mounting it, fit a noise reduction clamp at each end, then add a silencer on the outlet. Straight, smooth duct runs finish the job — every tight bend adds both noise and resistance.
AC Infinity four-layer flexible ducting
AC Infinity four-layer ducting is dual aluminium foil inside for heat and flame resistance, dual PVC outside to resist cuts and tears, and a steel-wire spiral holding it open. It bends around obstacles, cuts to length with tin snips, and every roll includes two stainless steel clamps.
| Size | Length | Suits |
|---|---|---|
| 100 mm (4″) | 2.4 m (8 ft) | 4″ inline fans and short runs |
| 100 mm (4″) | 7.6 m (25 ft) | 4″ fans, longer or multiple runs |
| 150 mm (6″) | 7.6 m (25 ft) | the most common tent size |
| 200 mm (8″) | 7.6 m (25 ft) | 8″ fans and larger rooms |
Want the smoothest bore and a fully light-proof run? The PVC-coated memory ducting (4.5 m lengths, not an AC Infinity product) has a shallower corrugation and a larger true inner diameter, so air moves through it more quietly.
Clamps, tape and window kits
Finish the job properly: stainless steel duct clamps in 100, 150, 200 and 250 mm hold joints tight, aluminium foil ducting tape seals them so you are not losing extraction through leaks, and the window duct kit gives you a tidy, adjustable outlet through a window or sliding door for 100 and 150 mm ducting. For dampers, reducers and Y-splitters, see duct work.
FAQ
What size ducting and silencer do I need?
Match the fan. A 150 mm fan takes 150 mm ducting and the 6″ silencer, and so on. Reducing the duct below the fan size costs you airflow and adds noise, so only step down with a proper reducer where there is no alternative.
Does a silencer reduce airflow?
The opening through the middle is the full duct size, so the effect is small — far smaller than the loss from a crushed duct or a tight bend. On a quiet setup the trade is well worth it.
Where should the silencer go?
On the fan outlet is the usual spot, with the carbon filter on the intake side. If the noise is coming back into the room through the intake, a second silencer there helps too.
Why does my fan still sound loud after fitting a silencer?
Check what the fan is touching. Hard-mounted to a tent frame or a shelf, the fan sends vibration straight into the structure and a silencer cannot help with that. Hang it on straps and fit noise reduction clamps at both ends.
How much ducting should I buy?
Buy enough to reach with gentle curves rather than exactly enough to reach. Long runs and sharp bends both cost airflow, so keep it as short and straight as the space allows and cut the rest off.
Can I use this ducting with a heater?
No. Heat-generating equipment needs ducting rated for it — see the thermal-resistant hose listed with the AC Infinity Thermoforge heater.