AC Infinity CLOUDLINE S4
#2 in 4 inFull review
A quiet, efficient 4 in fan for small grow tents, closets and AV cabinets. The S line adds a longer cord and more airflow than the cheaper A4.
Amazon $89.99$89.99
4 in226 CFM8.1 CFM/W26 dBA
3.4/5
A quiet, efficient 4 in EC fan for small grow tents, priced below the CLOUDLINE S4.
- 205 CFMAirflow
- 27 WPower
- 26.8 dBANoise
- ECMotor
Check price at Amazon$79.99
Price checked November 8, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- One of the quietest 4 in fans at full speed (26.8 dB rated)
- Efficient EC motor at 27 W
- Works with Spider Farmer’s GGS smart controller later
Cons
- Warranty term for fans not stated
- No static pressure rating published
The Spider Farmer inline fan family
Every Spider Farmer inline fan model we rank, smallest first. Ratings compare each against its own duct size.
| Model | Airflow | Rating | Price |
|---|---|---|---|
| Spider Farmer 4 in Inline Fan (this one) | 205 CFM | 3.4/5 | $79.99 |
| Spider Farmer 6 in Inline Fan | 402 CFM | 3.1/5 | $115.99 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its duct size. How we rank explains each one.
Specifications
| Model number | SF-4Inlinefan |
|---|---|
| Performance | |
| Duct size | 4 in |
| Rated airflow | 205 CFM |
| Power at full speed | 27 W |
| Power figure | Rated power |
| Airflow per watt | 7.6 CFM/W |
| Price per 100 CFM | $39.02 |
| Noise at full speed | 26.8 dBA |
| Top speed | 3,000 RPM |
| Controls | |
| Motor | EC |
| Controller | Speed controller with RJ12 port |
| Speeds | Stepless |
| Temperature and humidity control | No |
| Phone app | No |
| Timer or cycle modes | No |
| Build | |
| Housing | Plastic |
| Ingress rating | IP42 |
| Voltage | 120 V |
Alternatives in this duct size
AC Infinity CLOUDLINE T4
#3 in 4 inFull review
The S4 fan paired with a temperature and humidity controller and WiFi app. For a small grow tent that should run itself.
Amazon $119$119
4 in226 CFM8.1 CFM/W26 dBA
Hon&Guan PRO 4 in Inline Fan
#5 in 4 inFull review
A low-cost 4 in EC fan with strong rated airflow. Its power draw is not published, which keeps it below documented rivals.
Amazon $63.99$63.99
4 in212 CFM28 dBA
Compare
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