AC Infinity CLOUDLINE T6 Review
Research verdict (not hands-on tested, no star rating)
The T6 is a well-specified 6-inch EC fan with unusually high published static pressure and a controller that does the job most tents need: ramp the fan when it gets hot or humid. It is more fan than a 4x4 strictly needs, which is the point, since owners report running it at low, quiet speeds. If you don't want automation, the S6 is the same fan for less.
Strengths
- 503 Pa published static pressure holds airflow through a carbon filter and duct
- Controller ramps speed on temperature, humidity or VPD
- EC motor, dual ball bearings rated 67,000 hours, IP44
- Owners commonly report running it below half speed in a 4x4
Weaknesses
- No independent airflow or noise measurement published that we could find
- AC Infinity's own listings disagree on CFM and noise (425 CFM/30 dBA vs 402 CFM/32 dBA)
- 2-year warranty (AC Infinity gives 5 years only on IONFRAME lights)
- Plastic housing, per owner reports
Specs: manufacturer vs independent
| Spec | Manufacturer says | Published independent measurement |
|---|---|---|
| Rated airflow | 425 CFM on AC Infinity's current page; 402 CFM on older listings | None published that we could find |
| Rated noise | 30 dBA (current page); 32 dBA (older listings) | None published that we could find |
| Static pressure | 503 Pa | None published that we could find |
| Motor | EC motor, PWM speed control, dual ball bearings rated 67,000 h | None published that we could find |
| Max power | 70 W | None published that we could find |
| Ingress rating | IP44 | None published that we could find |
| Controller | Temperature, humidity and VPD triggers; 12 ft sensor probe | None published that we could find |
| Warranty | 2 years | None published that we could find |
| Airflow through filter and duct | — | No published measurement. Owner reports compiled by SimpleHydroponic suggest a 20–35% drop. |
We did not measure anything ourselves. Independent figures come from the cited third parties; see Sources and how we research.
The CLOUDLINE T6 is the inline fan most often bundled with, or recommended for, a 4x4 tent. This review puts AC Infinity’s published specs next to what owners report, because nobody we could find has published an independent airflow or noise measurement of it.
Who it’s for
- Good fit: a 3x3 to 5x5 tent with a 6-inch carbon filter, especially if your room temperature swings and you want the fan to react on its own.
- Consider the S6 instead: if you will pick one speed and leave it there. Same fan, manual 10-speed controller.
- Too much for: a 2x2 or 2x4 with a 4-inch filter. See the 4-inch options in our inline fan guide.
What the specs say
AC Infinity’s current product page lists 425 CFM at 30 dBA. Older AC Infinity listings and most retailers list the same model at 402 CFM and 32 dBA. We cannot tell whether that reflects a hardware revision or a change in how it is measured, so we would plan around the lower figure.
The more useful number is static pressure: 503 Pa. Static pressure is how hard a fan can push against resistance, and a carbon filter is a lot of resistance. Many budget fans do not publish it at all. AC Infinity also lists an EC motor with PWM speed control, dual ball bearings rated for 67,000 hours, IP44 protection, and 70 W maximum draw.
Real airflow once it’s installed
Rated CFM is measured with nothing attached. SimpleHydroponic’s summary of owner reports says effective airflow drops 20–35% once a carbon filter and ducting are connected. LONGWELL’s sizing method assumes a similar penalty (25% for the filter, more for duct length and bends).
Even after that loss, a T6 rated at 402–425 CFM has plenty of room for a 4x4, which needs about 190–200 CFM with a filter and a typical duct run. That headroom is the main reason to buy a fan this size: running it at partial speed keeps it quiet. Size your own setup with our fan CFM calculator.
The controller
The T6 controller reads temperature and humidity from a 12 ft probe and can raise fan speed when either passes a threshold you set, or target VPD. In practice that means the fan idles quietly with the lights off and ramps up when the light warms the tent. It also plugs into AC Infinity’s wider UIS ecosystem of controllers, clip fans and lights. Our Vivosun vs AC Infinity and Spider Farmer vs AC Infinity comparisons cover how those ecosystems differ.
What owners report
From SimpleHydroponic’s roundup of owner feedback:
- Owners consistently report running it below half speed in typical tents.
- The plastic housing is dense and well finished but feels less premium than the price implies.
- The model names confuse first-time buyers: the S6 is the same fan with a basic dial, the T6 adds the smart controller, and the A6 is a separate lower-flow model.
Warranty
AC Infinity’s warranty page lists two years from the date of purchase. Physical defects on arrival should be reported within 30 days, and AC Infinity provides prepaid return labels for U.S. addresses.
Bottom line
On paper the T6 is one of the better-specified 6-inch fans you can buy for a tent, and owner reports back up the quiet-at-low-speed claim. What is missing is an independent measurement of airflow and noise. If one is published, we will add it here.
FAQ
What is the difference between the CLOUDLINE S6 and T6?
They share the same 6-inch fan. The S6 comes with a 10-speed manual controller; the T6 adds a controller that changes fan speed automatically based on temperature, humidity or VPD readings from a sensor probe.
Is the CLOUDLINE T6 too big for a 4x4 tent?
No. A 4x4 with a carbon filter and some ducting needs roughly 190–200 CFM by LONGWELL's sizing formulas. The T6 is rated well above that, so it can run at partial speed, which is quieter and uses less power.
How loud is the CLOUDLINE T6?
AC Infinity rates it at 30 dBA on its current page and 32 dBA on older listings. We could not find an independent noise measurement. Owners report it is quiet at the low and medium speeds a 4x4 typically needs.
How much airflow do you lose through a carbon filter?
There is no independent measurement for this fan. LONGWELL's sizing method adds 25% for a filter, and SimpleHydroponic's summary of owner reports puts the loss at 20–35% with a filter and ducting.
What warranty does AC Infinity give on the T6?
AC Infinity's warranty page lists two years from the date of purchase for its products, with five years only for IONFRAME grow lights bought from July 1, 2024.
Sources
Specs and measurements change between product revisions. We list the date we last checked each source.
- Manufacturer AC Infinity CLOUDLINE T6 inline fan with temperature/humidity/VPD controller, product page, AC Infinity. Checked Nov 13, 2026. Current page lists 425 CFM and 30 dBA; older AC Infinity listings and retailers show 402 CFM and 32 dBA.
- Manufacturer AC Infinity CLOUDLINE S6 inline fan with speed controller, product page, AC Infinity. Checked Nov 13, 2026.
- Manufacturer AC Infinity warranty program, AC Infinity. Checked Nov 13, 2026.
- Owner feedback AC Infinity CLOUDLINE PRO T6 review (spec and owner-feedback roundup), SimpleHydroponic. Checked Nov 13, 2026. Aggregates owner reports; the site does not state hands-on measurements.
- Reference Grow tent fan size calculator: formulas, LONGWELL Fans. Checked Nov 13, 2026.