AC Infinity CLOUDLINE S6
#2 in 6 inFull review
The usual pick for a 4x4 or 5x5 grow tent with a carbon filter: plenty of airflow, high static pressure and quiet running.
Amazon $99$99
The AC Infinity CLOUDLINE S6 is the better inline duct fan overall, rated 3.4 to 3.0. The AC Infinity CLOUDLINE S6 leads on airflow, value and noise. The AC Infinity CLOUDLINE A6 costs $9.01 less ($89.99 vs $99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
AC Infinity CLOUDLINE A6
#8 in 6 inFull review
A cheaper 6 in CLOUDLINE with less airflow and a little more noise than the S6. A fine fit for a tent that does not need the full 425 CFM.
Amazon $89.99$89.99
Which should you buy?
- Choose the AC Infinity CLOUDLINE S6 for airflow (425 CFM through 6 in duct vs 352 CFM through 6 in duct), value ($23.29 per 100 CFM ($99, 425 CFM) vs $25.57 per 100 CFM ($89.99, 352 CFM)) and noise (30 dBA at full speed vs 34 dBA at full speed).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 6 in inline duct fan; a clear win is highlighted. How we rank explains each one.
| Factor weight | AC Infinity CLOUDLINE S6 | AC Infinity CLOUDLINE A6 |
|---|---|---|
| Overall rating | 3.4/5 | 3.0/5 |
| Value 25% | 55 $23.29 per 100 CFM ($99, 425 CFM) | 46 $25.57 per 100 CFM ($89.99, 352 CFM) |
| Efficiency 25% | 34 6.1 CFM per watt (425 CFM, 70 W) | 27 5.4 CFM per watt (352 CFM, 65 W) |
| Airflow 15% | 88 425 CFM through 6 in duct | 51 352 CFM through 6 in duct |
| Noise 15% | 86 30 dBA at full speed | 74 34 dBA at full speed |
| Controls 10% | 40 speed controller included | 40 speed controller included |
| Warranty 10% | 25 2-year warranty | 25 2-year warranty |
Specifications
| AC Infinity CLOUDLINE S6 | AC Infinity CLOUDLINE A6 | |
|---|---|---|
| Performance | ||
| Duct size | 6 in | 6 in |
| Rated airflow | 425 CFM | 352 CFM |
| Static pressure (not scored) | 503 Pa | 394 Pa |
| Power at full speed | 70 W | 65 W |
| Power figure | Max power draw | Max power draw |
| Average power (not scored) | 38 W | 35 W |
| Airflow per watt | 6.1 CFM/W | 5.4 CFM/W |
| Price per 100 CFM | $23.29 | $25.57 |
| Noise at full speed | 30 dBA | 34 dBA |
| Controls | ||
| Motor | EC | EC |
| Controller | 10-speed controller | 10-speed controller |
| Speeds | 10 | 10 |
| Temperature and humidity control | No | No |
| Phone app | No | No |
| Timer or cycle modes | No | No |
| Build | ||
| Housing | Plastic | Plastic |
| Ingress rating | IP44 | IP44 |
| Voltage | 100-240 V | 100-240 V |
| Warranty | 2 years | 2 years |