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 3.1. The AC Infinity CLOUDLINE S6 leads on value and airflow. The AC Infinity CLOUDLINE S6 costs $16.99 less ($99 vs $115.99).
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.
Spider Farmer 6 in Inline Fan
#7 in 6 inFull review
A quiet 6 in EC fan for 4x4 tents, best for owners already using Spider Farmer’s GGS controller.
Amazon $115.99$115.99
Which should you buy?
- Choose the AC Infinity CLOUDLINE S6 for value ($23.29 per 100 CFM ($99, 425 CFM) vs $28.85 per 100 CFM ($115.99, 402 CFM)) and airflow (425 CFM through 6 in duct vs 402 CFM through 6 in duct).
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 | Spider Farmer 6 in Inline Fan |
|---|---|---|
| Overall rating | 3.4/5 | 3.1/5 |
| Value 25% | 55 $23.29 per 100 CFM ($99, 425 CFM) | 33 $28.85 per 100 CFM ($115.99, 402 CFM) |
| Efficiency 25% | 34 6.1 CFM per watt (425 CFM, 70 W) | 39 6.5 CFM per watt (402 CFM, 62 W) |
| Airflow 15% | 88 425 CFM through 6 in duct | 76 402 CFM through 6 in duct |
| Noise 15% | 86 30 dBA at full speed | 80 32 dBA at full speed |
| Controls 10% | 40 speed controller included | 40 speed controller included |
| Warranty 10% | 25 2-year warranty | 0 warranty not published, scored as none |
Specifications
| AC Infinity CLOUDLINE S6 | Spider Farmer 6 in Inline Fan | |
|---|---|---|
| Performance | ||
| Duct size | 6 in | 6 in |
| Rated airflow | 425 CFM | 402 CFM |
| Static pressure (not scored) | 503 Pa | - |
| Power at full speed | 70 W | 62 W |
| Power figure | Max power draw | Rated power |
| Average power (not scored) | 38 W | - |
| Airflow per watt | 6.1 CFM/W | 6.5 CFM/W |
| Price per 100 CFM | $23.29 | $28.85 |
| Noise at full speed | 30 dBA | 32 dBA |
| Controls | ||
| Motor | EC | EC |
| Controller | 10-speed controller | Speed controller with RJ12 port |
| Speeds | 10 | Stepless |
| Temperature and humidity control | No | No |
| Phone app | No | No |
| Timer or cycle modes | No | No |
| Build | ||
| Housing | Plastic | Plastic |
| Ingress rating | IP44 | IP42 |
| Voltage | 100-240 V | - |
| Warranty | 2 years | - |