The AC Infinity T4 Air Filtration Kit is the complete 100 mm (4″) extraction setup in one purchase: a CLOUDLINE PRO T4 inline fan with Controller 69 Pro, an Australian-charcoal carbon filter, four-layer flexible ducting, with the clamps, straps and brackets to hang it all. Bought as a kit it costs less than the same parts individually, and it arrives as one order rather than four. Everything is the right diameter for everything else, which is the part people most often get wrong when buying piece by piece.
Everything in the kit
| In the kit | What it is |
|---|---|
| AC Infinity CLOUDLINE PRO T4 inline fan | With Controller 69 Pro and corded thermal probe. 384 m³/h (226 CFM) at 26 dBA. Model AI-CLT4. |
| AC Infinity Duct Carbon Filter 100 mm (4″) | Australian Virgin RC412 charcoal, 1200+ IAV in a 38 mm bed, reversible aluminium flanges. Two pre-filter cloths and two hanging straps included. Model AC-DCF4. |
| AC Infinity Flexible Four-Layer Ducting 100 mm (4″) | 2.4 m (8 ft), dual aluminium foil inside, dual PVC outside, steel-wire spiral. Two stainless duct clamps included. Model AI-DTA4-8. |
| Mounting hardware | Stainless duct clamps, rope-ratchet hangers, mounting brackets and screws, and the printed manual, as supplied with each component. |
Each component has its own page if you want the full detail: CLOUDLINE PRO T4 fan, 4″ carbon filter, 4″ four-layer ducting.
Why buy it as a kit
Two reasons, and only one of them is the price. The obvious one is that the bundle costs less than the four items bought separately.
The less obvious one is sizing. A ventilation run is a chain, and the weakest link sets the airflow. Put a 100 mm fan on a smaller filter and static pressure climbs, real airflow drops well below the rated figure, and the fan gets louder rather than quieter. Mismatched diameters also mean adapters, and every adapter is another joint to seal. Everything in this kit is 100 mm end to end, so it clamps together and works at the airflow the fan is rated for.
What it will handle
This kit suits up to about 1.0 × 1.0 m comfortably, and will cover a 1.2 × 1.2 m (4×4) tent at minimum spec. The T4 is the quietest fan in the CLOUDLINE range at 26 dBA, which matters more than people expect in a spare room or a wardrobe grow where the fan is a few metres from where you sleep.
Those are working guides, not rules. For a figure based on your actual room, duct length and number of bends, use our exhaust fan size calculator.
The controller is the part that does the work
Controller 69 Pro is included with the fan, not sold as an extra. It reads temperature and humidity from a corded probe inside the space and drives the fan to ten speeds in response. You can set straight triggers (above 28°C, run harder), VPD targets, timers, cycles and schedules, and set minimum baseline speeds so the fan never fully stops when you want constant air exchange. It joins WiFi for app control and logging from a phone.
This matters for a kit in particular: the fan spends most of its life well below maximum, which is where the EC motor is at its quietest and cheapest to run. Maximum airflow is headroom for the hot days, not the setting you live at.
Putting it together
Air flows filter → fan → ducting → outside. The filter hangs inside the space at the top where the hot air collects, the fan pulls through it, and the ducting carries scrubbed air out. Hang both from the straps or rope ratchets rather than resting the fan on the filter — weight on a filter flange is what bends them.
Pull the ducting taut rather than leaving it concertinaed, keep bends wide and sweeping, and cut off what you do not need with tin snips instead of coiling the excess behind the fan. Then foil-tape the joints. Ten minutes of taping recovers airflow you have already paid for.
Fan and controller setup is covered in the CLOUDLINE S & T series manual (PDF).
Full specifications
| Kit assembled by | Quick Bloom Lights, from genuine AC Infinity components |
| Kit code | AC-FKT4 |
| Duct diameter throughout | 100 mm (4″) |
| Fan model | CLOUDLINE PRO T4 / AI-CLT4 |
| Fan maximum airflow | 384 m³/h (226 CFM) |
| Fan maximum noise | 26 dBA |
| Fan static pressure | 223 Pa |
| Fan maximum / average power | 28 W / 21 W |
| Fan dimensions | 188 × 303 × 176 mm |
| Controller | Controller 69 Pro, included, with 3.66 m corded thermal probe |
| Voltage / frequency | 100–240 V AC / 50–60 Hz, Australian three-pin plug |
| Fan certification | SAA approval GMA-519959-EA (PDF) |
| Filter model | Duct Carbon Filter 4″ / AC-DCF4 |
| Filter carbon | Australian Virgin RC412, 1200+ IAV, 38 mm bed |
| Filter rated airflow | 210 CFM |
| Filter dimensions | 300 × 177 mm |
| Ducting | Four-Layer Ducting 4″ / AI-DTA4-8, 2.4 m (8 ft) |
| Warranty | Two years on the fan, handled in Australia by Quick Bloom Lights |
| Product manual | CLOUDLINE S & T series manual (PDF) |
FAQ
Is it cheaper than buying the parts separately?
Yes — that is the point of the kit. It is priced below the sum of the parts and arrives as one order. Everything in it is genuine AC Infinity with the normal Australian warranty.
Which controller does it come with?
Controller 69 Pro, with the corded temperature and humidity probe. That is what is in the box on the stock we hold. It gives you triggers, VPD targets, timers, schedules, ten fan speeds and WiFi app control.
Do I need anything else to get running?
For a standard tent setup, no. Fan, filter, ducting, clamps, straps and brackets are all here. Most people add foil ducting tape to seal the joints, and a noise reduction clamp or duct silencer if noise is a concern, plus a backdraft damper if the duct exits somewhere the wind blows back down it.
Can I swap the ducting length?
Not within the kit, but the ducting cuts down easily with tin snips, and the offcut is useful for an intake run. If you need a different length, buy it separately from the ducting range.
Should I run the carbon filter from day one?
Usually not, and this is advice that costs us filter life rather than earns it. Veg combines the highest humidity with the least odour, and carbon adsorbs water vapour as readily as it adsorbs smell — so a filter run through veg clogs with moisture while scrubbing air that had little in it to scrub. Run the fan and ducting for airflow, and fit the filter when odour appears or at the flip into flower.
How long does the carbon filter last?
Around 12 months is the usual working figure, longer in favourable conditions. When odour starts getting through, the intake end of the carbon has loaded up — unscrew both flanges, turn the body around and run the fresh end. That reversible design is worth real money over the life of the filter.
Does the fan run at full speed all the time?
It should not. The controller runs it at whatever speed holds your target temperature, humidity or VPD, which for most of a grow is well down the range. That is where the EC motor is quietest and cheapest to run, and where the kit spends most of its life.
Is this genuine AC Infinity stock with Australian warranty?
Yes. Quick Bloom Lights is the official Australian importer and distributor for AC Infinity. Stock is held in Sydney, orders ship domestically, and warranty is handled here rather than through an overseas seller.