Grow Tent Fans & Ventilation
Ventilation is the system that makes every other piece of equipment work. It pulls heat out before it stalls your plants, keeps humidity in the range you actually chose, feeds fresh CO₂ to the canopy, and — with a carbon filter in the line — takes the smell out on the way past. This is the full AC Infinity ventilation range: CLOUDLINE inline fans, carbon filters, ducting and silencers, clip and circulation fans, shutter and exhaust fans and complete fan and filter kits. Quick Bloom Lights is the official Australian importer for AC Infinity: stocked in Sydney, shipped domestically.
100–300 mm
4 to 12 inch duct sizes
226–1604 CFM
CLOUDLINE airflow range
From 26 dBA
quiet EC motors
Genuine
genuine AC Infinity, QBL-backed
Start here: sizing the fan to your space
The target is simple — move the whole volume of air in your tent or room roughly once a minute, then add headroom for the things that slow it down. A carbon filter, every bend in the ducting, and a silencer all cost you airflow, so a fan chosen with no margin ends up running flat out, which is both louder and shorter-lived than the same job done by a larger fan on a lower speed.
| Grow space | Volume | Suggested fan | Airflow |
|---|---|---|---|
| Up to 60 × 60 cm | ~0.5 m³ | CLOUDLINE S4 or T4 (100 mm) | 226 CFM / 384 m³/h |
| 90 × 90 or 120 × 60 cm | 1.5–1.8 m³ | 100 mm, or 150 mm with a filter | 226–425 CFM |
| 120 × 120 cm | ~2.9 m³ | CLOUDLINE S6 or T6 (150 mm) | 425 CFM / 722 m³/h |
| 150 × 150 cm | ~4.5 m³ | 150 mm, or 200 mm for headroom | 425–857 CFM |
| 240 × 120 cm | ~5.8 m³ | CLOUDLINE S8 or T8 (200 mm) | 857 CFM / 1456 m³/h |
| 300 × 150 cm and up | 9 m³+ | CLOUDLINE T10 (250 mm) | 1201 CFM / 2041 m³/h |
| Rooms and multi-tent setups | 18 m³+ | CLOUDLINE T12 (300 mm) | 1604 CFM / 2725 m³/h |
Size up rather than down. A larger fan running at 40% is quieter, cooler and lasts longer than a smaller one running at 100%, and it leaves you room to add a filter or a longer duct run later. There is a full walk-through on the fan sizing page if you want to work it out from your own measurements.
AC Infinity CLOUDLINE inline fans
The CLOUDLINE range is a mixed-flow fan on a PWM-controlled EC motor with dual ball bearings, rated to an L10 life of 67,000 hours and sealed to IP44. Mixed-flow means it holds its airflow against the back-pressure of a filter and a duct run, which is where cheaper axial fans fall away. Every size mounts horizontally or vertically.
Two lines, same fan body. The S series ships with a wired ten-speed controller — set it and leave it. The T series ships with the CONTROLLER 69 PRO, which adds temperature, humidity and VPD triggers, scheduling, cycles and dynamic speed that rises and falls with conditions, over WiFi and Bluetooth.
| Fan | Duct | Airflow | Static pressure | Noise | Max power |
|---|---|---|---|---|---|
| S4 / T4 | 100 mm (4″) | 226 CFM | 223 Pa | 26 dBA | 28 W |
| S6 / T6 | 150 mm (6″) | 425 CFM | 503 Pa | 30 dBA | 70 W |
| S8 / T8 | 200 mm (8″) | 857 CFM | 746 Pa | 38 dBA | 180 W |
| T10 | 250 mm (10″) | 1201 CFM | 1059 Pa | 48 dBA | 255 W |
| T12 | 300 mm (12″) | 1604 CFM | 818 Pa | 62 dBA | 250 W |
Noise figures are measured at full speed. In a real tent most fans spend their life between 3 and 6 on the dial, well below those numbers. If you want the quietest possible result, the VIND silenced inline fans carry the acoustic lining inside the fan housing.
Carbon filters
A fan moves air; a carbon filter is what decides whether that air carries odour with it. AC Infinity filters sold here are packed with Australian charcoal, and they run on the intake side of the fan so the fan pulls air through the carbon bed rather than pushing it.
Match the filter to the fan: a 150 mm fan takes a 150 mm filter. The refillable kits are worth a look if you run continuously — when the carbon is spent you replace the media rather than the whole filter, which is cheaper per season and a lot less to throw away.
Ducting, silencers and fittings
Four-layer flexible ducting in 100, 150 and 200 mm, inline duct silencers that take up to 50% of the fan noise out of the run, rubber noise reduction clamps that stop vibration reaching the tent frame, stainless clamps, foil tape and window kits. For dampers, reducers, Y-splitters, collars and grilles, see duct work.
The order that matters for noise. Size the fan so it runs at a lower speed; hang it on straps rather than bolting it to the frame; fit a rubber noise reduction clamp at each end; then add a silencer on the outlet. Straight, smooth duct runs finish the job — every tight bend costs you both airflow and quiet.
Circulation inside the tent
Extraction handles the air leaving the tent. Clip and circulation fans handle the air inside it: breaking up the still, humid layer that sits on the leaf surface, strengthening stems, and evening out the temperature between canopy and floor. The CLOUDRAY range runs on the same EC motors as the inline fans, with ten speeds, dynamic wind modes and automatic oscillation, in 4, 6 and 9 inch. The CLOUDLIFT S14 is the floor and wall option for larger rooms.
Shutter, exhaust and room-to-room fans
AIRLIFT shutter fans mount through a wall in 10, 14 and 20 inch and vent a whole room, garage or workshop rather than a duct run, with the same CONTROLLER 69 PRO temperature and humidity control on the T models. The room-to-room fan moves air between two spaces through a wall in either direction.
Complete kits
The T-series air filtration kits pair a CLOUDLINE T fan with the matching Australian-charcoal carbon filter, ducting and clamps in one box, in 100, 150 and 200 mm. Everything is sized to work together, which removes the most common setup mistake — a fan and filter that do not match.
FAQ
What size fan do I need for a 120 x 120 cm tent?
A 150 mm fan is the standard answer — the CLOUDLINE T6 or S6 at 425 CFM. That gives you enough headroom to run a carbon filter and a few bends of ducting while still sitting at a low speed most of the time.
Does a carbon filter reduce my airflow?
Yes, and you should plan for it. A clean filter costs a meaningful share of the fan’s rated airflow, and the loss grows as the carbon loads up. Choosing the next size up, or running the same size a couple of steps higher on the dial, covers it.
S series or T series?
The fan is the same. The S series gives you a ten-speed dial you set once. The T series adds the CONTROLLER 69 PRO: temperature, humidity and VPD triggers, scheduling and dynamic speed over WiFi and Bluetooth. If you want the tent to manage itself, or you already run other UIS devices, take the T.
Should the fan blow into the filter or pull through it?
Pull through it. Put the carbon filter on the intake side so the fan draws air through the carbon bed, then exhausts clean air down the duct. Blowing into a filter is less effective and pushes unfiltered air out of every joint before the filter.
How do I make the setup quieter?
In order of impact: size the fan so it runs at a lower speed, hang it on rope ratchets instead of hard-mounting it, fit rubber noise reduction clamps at both ends, add a duct silencer on the outlet, and keep the duct runs short and smooth.
Do the fans need a separate controller?
No. Every CLOUDLINE ships with its controller in the box — a wired ten-speed unit on the S series, the CONTROLLER 69 PRO on the T series. They are also compatible with the wider UIS controller range if you want one controller running several devices.
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.